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12.5u-75=5u-15
We move all terms to the left:
12.5u-75-(5u-15)=0
We get rid of parentheses
12.5u-5u+15-75=0
We add all the numbers together, and all the variables
7.5u-60=0
We move all terms containing u to the left, all other terms to the right
7.5u=60
u=60/7.5
u=8
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