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12u=7u+15
We move all terms to the left:
12u-(7u+15)=0
We get rid of parentheses
12u-7u-15=0
We add all the numbers together, and all the variables
5u-15=0
We move all terms containing u to the left, all other terms to the right
5u=15
u=15/5
u=3
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