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36=3u+12
We move all terms to the left:
36-(3u+12)=0
We get rid of parentheses
-3u-12+36=0
We add all the numbers together, and all the variables
-3u+24=0
We move all terms containing u to the left, all other terms to the right
-3u=-24
u=-24/-3
u=+8
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