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113=170-u
We move all terms to the left:
113-(170-u)=0
We add all the numbers together, and all the variables
-(-1u+170)+113=0
We get rid of parentheses
1u-170+113=0
We add all the numbers together, and all the variables
u-57=0
We move all terms containing u to the left, all other terms to the right
u=57
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