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142=-u+288
We move all terms to the left:
142-(-u+288)=0
We add all the numbers together, and all the variables
-(-1u+288)+142=0
We get rid of parentheses
1u-288+142=0
We add all the numbers together, and all the variables
u-146=0
We move all terms containing u to the left, all other terms to the right
u=146
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