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-40=-4(u+7)
We move all terms to the left:
-40-(-4(u+7))=0
We calculate terms in parentheses: -(-4(u+7)), so:We get rid of parentheses
-4(u+7)
We multiply parentheses
-4u-28
Back to the equation:
-(-4u-28)
4u+28-40=0
We add all the numbers together, and all the variables
4u-12=0
We move all terms containing u to the left, all other terms to the right
4u=12
u=12/4
u=3
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