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7u+12=5(u+6)
We move all terms to the left:
7u+12-(5(u+6))=0
We calculate terms in parentheses: -(5(u+6)), so:We get rid of parentheses
5(u+6)
We multiply parentheses
5u+30
Back to the equation:
-(5u+30)
7u-5u-30+12=0
We add all the numbers together, and all the variables
2u-18=0
We move all terms containing u to the left, all other terms to the right
2u=18
u=18/2
u=9
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