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8u=63+u
We move all terms to the left:
8u-(63+u)=0
We add all the numbers together, and all the variables
8u-(u+63)=0
We get rid of parentheses
8u-u-63=0
We add all the numbers together, and all the variables
7u-63=0
We move all terms containing u to the left, all other terms to the right
7u=63
u=63/7
u=9
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