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42=-u+172
We move all terms to the left:
42-(-u+172)=0
We add all the numbers together, and all the variables
-(-1u+172)+42=0
We get rid of parentheses
1u-172+42=0
We add all the numbers together, and all the variables
u-130=0
We move all terms containing u to the left, all other terms to the right
u=130
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