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-8(u+5)=8u+40
We move all terms to the left:
-8(u+5)-(8u+40)=0
We multiply parentheses
-8u-(8u+40)-40=0
We get rid of parentheses
-8u-8u-40-40=0
We add all the numbers together, and all the variables
-16u-80=0
We move all terms containing u to the left, all other terms to the right
-16u=80
u=80/-16
u=-5
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