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bookymb143
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little diffrent

KatrinaKaif
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Bring the 2x to the other side by substracting it
4x  2x  21 = 3
Bring 21 to the other side by adding it
4x  2x = +21  3
Simplify
2x = 18
x = 9

saifoo.khan
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2x = +18
x = 9

bookymb143
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keep bringing it down

anonymous
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is this absolute value? what is does the [ ] mean?

KatrinaKaif
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I think she means ( )

anonymous
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in math we seldom bring things. we usually add, subtract, multiply or divide. sometimes we bring apples to our teachers

anonymous
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steps are :
add 21 to both sides
subtract 2x from both sides
divide by 2