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7u-17=10u-80
We move all terms to the left:
7u-17-(10u-80)=0
We get rid of parentheses
7u-10u+80-17=0
We add all the numbers together, and all the variables
-3u+63=0
We move all terms containing u to the left, all other terms to the right
-3u=-63
u=-63/-3
u=+21
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