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8=12u-8u
We move all terms to the left:
8-(12u-8u)=0
We add all the numbers together, and all the variables
-(+4u)+8=0
We get rid of parentheses
-4u+8=0
We move all terms containing u to the left, all other terms to the right
-4u=-8
u=-8/-4
u=+2
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