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-9u-45=-3(u+3)
We move all terms to the left:
-9u-45-(-3(u+3))=0
We calculate terms in parentheses: -(-3(u+3)), so:We get rid of parentheses
-3(u+3)
We multiply parentheses
-3u-9
Back to the equation:
-(-3u-9)
-9u+3u+9-45=0
We add all the numbers together, and all the variables
-6u-36=0
We move all terms containing u to the left, all other terms to the right
-6u=36
u=36/-6
u=-6
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