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Multiply both sides by 2.

And you're done.

why 2?

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

and what do u mean multiply?

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

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

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

yes

we multiply x by 2?

Both sides.

can u demonstrate?

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

then the answer will be?

\[15 \cdot 2\]

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

why do we multiply it with 2 then?

As said above, we divide by one-half which is the same as multiplying 2.

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