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9u-39=-5(u-9)
We move all terms to the left:
9u-39-(-5(u-9))=0
We calculate terms in parentheses: -(-5(u-9)), so:We get rid of parentheses
-5(u-9)
We multiply parentheses
-5u+45
Back to the equation:
-(-5u+45)
9u+5u-45-39=0
We add all the numbers together, and all the variables
14u-84=0
We move all terms containing u to the left, all other terms to the right
14u=84
u=84/14
u=6
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