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12u=36+3u
We move all terms to the left:
12u-(36+3u)=0
We add all the numbers together, and all the variables
12u-(3u+36)=0
We get rid of parentheses
12u-3u-36=0
We add all the numbers together, and all the variables
9u-36=0
We move all terms containing u to the left, all other terms to the right
9u=36
u=36/9
u=4
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