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42=u/9+35
We move all terms to the left:
42-(u/9+35)=0
We get rid of parentheses
-u/9-35+42=0
We multiply all the terms by the denominator
-u-35*9+42*9=0
We add all the numbers together, and all the variables
-1u+63=0
We move all terms containing u to the left, all other terms to the right
-u=-63
u=-63/-1
u=+63
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