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-8(u+7)=-4u-40
We move all terms to the left:
-8(u+7)-(-4u-40)=0
We multiply parentheses
-8u-(-4u-40)-56=0
We get rid of parentheses
-8u+4u+40-56=0
We add all the numbers together, and all the variables
-4u-16=0
We move all terms containing u to the left, all other terms to the right
-4u=16
u=16/-4
u=-4
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