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12=174-u
We move all terms to the left:
12-(174-u)=0
We add all the numbers together, and all the variables
-(-1u+174)+12=0
We get rid of parentheses
1u-174+12=0
We add all the numbers together, and all the variables
u-162=0
We move all terms containing u to the left, all other terms to the right
u=162
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