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7u+42=5(u+8)
We move all terms to the left:
7u+42-(5(u+8))=0
We calculate terms in parentheses: -(5(u+8)), so:We get rid of parentheses
5(u+8)
We multiply parentheses
5u+40
Back to the equation:
-(5u+40)
7u-5u-40+42=0
We add all the numbers together, and all the variables
2u+2=0
We move all terms containing u to the left, all other terms to the right
2u=-2
u=-2/2
u=-1
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