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ParthKohli
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Multiply both sides by 2.

ParthKohli
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And you're done.

AmberCat21
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why 2?

ParthKohli
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OK, let's think of it this way: divide both sides by \(\large {1 \over 2}\).

AmberCat21
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and what do u mean multiply?

ParthKohli
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Multiplication... is... the... basic... thing... they... teach... you... in... multiplication... tables.

ParthKohli
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Remember this?
2 x 1 = 2
2 x 2 = 4
2 x 3 = 6
2 x 4 = 8
2 x 5 = 10
2 x 6 = 12

ParthKohli
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Basically, you just wanna get the \(\rm x\) alone.

AmberCat21
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i'm sorry why do we multiply 2 to both sides is what i meant ;)

ParthKohli
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Think of it this way: we must divide both sides by \(\Large {1 \over 2}\) which just means multiplying 2. Right?

AmberCat21
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yes

AmberCat21
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we multiply x by 2?

ParthKohli
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Both sides.

AmberCat21
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can u demonstrate?

ParthKohli
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\[\rm {1 \over 2}x\cdot 2 = {15 \cdot 2} \]

AmberCat21
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then the answer will be?

ParthKohli
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\[15 \cdot 2\]

AmberCat21
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ok..so WHAT IF 1/2x is equals to 3..and it will look like 3/2=30?

jazy
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What do mean if (1/2)x = 3?
You multiplied by 2 in order to isolate the x...to let it alone on one side. So:
\[x = 15 \times 2\]

AmberCat21
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why do we multiply it with 2 then?

ParthKohli
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As said above, we divide by onehalf which is the same as multiplying 2.

jazy
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To UNDO the (1/2)x we multiply by 2.
We want to solve for x, find it's value. So we need it isolated on one side.

jazy
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Once you multiply by 2, the (1/2) is gone.