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15u=8u+49
We move all terms to the left:
15u-(8u+49)=0
We get rid of parentheses
15u-8u-49=0
We add all the numbers together, and all the variables
7u-49=0
We move all terms containing u to the left, all other terms to the right
7u=49
u=49/7
u=7
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