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172=12-u
We move all terms to the left:
172-(12-u)=0
We add all the numbers together, and all the variables
-(-1u+12)+172=0
We get rid of parentheses
1u-12+172=0
We add all the numbers together, and all the variables
u+160=0
We move all terms containing u to the left, all other terms to the right
u=-160
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