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5u-27=9(u-7)
We move all terms to the left:
5u-27-(9(u-7))=0
We calculate terms in parentheses: -(9(u-7)), so:We get rid of parentheses
9(u-7)
We multiply parentheses
9u-63
Back to the equation:
-(9u-63)
5u-9u+63-27=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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