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36=2u+4u
We move all terms to the left:
36-(2u+4u)=0
We add all the numbers together, and all the variables
-(+6u)+36=0
We get rid of parentheses
-6u+36=0
We move all terms containing u to the left, all other terms to the right
-6u=-36
u=-36/-6
u=+6
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