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42=u/8+35
We move all terms to the left:
42-(u/8+35)=0
We get rid of parentheses
-u/8-35+42=0
We multiply all the terms by the denominator
-u-35*8+42*8=0
We add all the numbers together, and all the variables
-1u+56=0
We move all terms containing u to the left, all other terms to the right
-u=-56
u=-56/-1
u=+56
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