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-6u+45=-9(u-2)
We move all terms to the left:
-6u+45-(-9(u-2))=0
We calculate terms in parentheses: -(-9(u-2)), so:We get rid of parentheses
-9(u-2)
We multiply parentheses
-9u+18
Back to the equation:
-(-9u+18)
-6u+9u-18+45=0
We add all the numbers together, and all the variables
3u+27=0
We move all terms containing u to the left, all other terms to the right
3u=-27
u=-27/3
u=-9
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