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27=-9(u-8)
We move all terms to the left:
27-(-9(u-8))=0
We calculate terms in parentheses: -(-9(u-8)), so:We get rid of parentheses
-9(u-8)
We multiply parentheses
-9u+72
Back to the equation:
-(-9u+72)
9u-72+27=0
We add all the numbers together, and all the variables
9u-45=0
We move all terms containing u to the left, all other terms to the right
9u=45
u=45/9
u=5
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