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-4u+2(u-4)=8
We move all terms to the left:
-4u+2(u-4)-(8)=0
We multiply parentheses
-4u+2u-8-8=0
We add all the numbers together, and all the variables
-2u-16=0
We move all terms containing u to the left, all other terms to the right
-2u=16
u=16/-2
u=-8
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