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12u=3u+45
We move all terms to the left:
12u-(3u+45)=0
We get rid of parentheses
12u-3u-45=0
We add all the numbers together, and all the variables
9u-45=0
We move all terms containing u to the left, all other terms to the right
9u=45
u=45/9
u=5
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