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36=8u-4u
We move all terms to the left:
36-(8u-4u)=0
We add all the numbers together, and all the variables
-(+4u)+36=0
We get rid of parentheses
-4u+36=0
We move all terms containing u to the left, all other terms to the right
-4u=-36
u=-36/-4
u=+9
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