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8u+4(u-4)=-4
We move all terms to the left:
8u+4(u-4)-(-4)=0
We add all the numbers together, and all the variables
8u+4(u-4)+4=0
We multiply parentheses
8u+4u-16+4=0
We add all the numbers together, and all the variables
12u-12=0
We move all terms containing u to the left, all other terms to the right
12u=12
u=12/12
u=1
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