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42=u/2+17
We move all terms to the left:
42-(u/2+17)=0
We get rid of parentheses
-u/2-17+42=0
We multiply all the terms by the denominator
-u-17*2+42*2=0
We add all the numbers together, and all the variables
-1u+50=0
We move all terms containing u to the left, all other terms to the right
-u=-50
u=-50/-1
u=+50
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