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2u-8=-9(u-4)
We move all terms to the left:
2u-8-(-9(u-4))=0
We calculate terms in parentheses: -(-9(u-4)), so:We get rid of parentheses
-9(u-4)
We multiply parentheses
-9u+36
Back to the equation:
-(-9u+36)
2u+9u-36-8=0
We add all the numbers together, and all the variables
11u-44=0
We move all terms containing u to the left, all other terms to the right
11u=44
u=44/11
u=4
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