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170=234-u
We move all terms to the left:
170-(234-u)=0
We add all the numbers together, and all the variables
-(-1u+234)+170=0
We get rid of parentheses
1u-234+170=0
We add all the numbers together, and all the variables
u-64=0
We move all terms containing u to the left, all other terms to the right
u=64
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