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252=146-u
We move all terms to the left:
252-(146-u)=0
We add all the numbers together, and all the variables
-(-1u+146)+252=0
We get rid of parentheses
1u-146+252=0
We add all the numbers together, and all the variables
u+106=0
We move all terms containing u to the left, all other terms to the right
u=-106
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