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88=-u+172
We move all terms to the left:
88-(-u+172)=0
We add all the numbers together, and all the variables
-(-1u+172)+88=0
We get rid of parentheses
1u-172+88=0
We add all the numbers together, and all the variables
u-84=0
We move all terms containing u to the left, all other terms to the right
u=84
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