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3u-15=7(u+3)
We move all terms to the left:
3u-15-(7(u+3))=0
We calculate terms in parentheses: -(7(u+3)), so:We get rid of parentheses
7(u+3)
We multiply parentheses
7u+21
Back to the equation:
-(7u+21)
3u-7u-21-15=0
We add all the numbers together, and all the variables
-4u-36=0
We move all terms containing u to the left, all other terms to the right
-4u=36
u=36/-4
u=-9
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