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285=135-u
We move all terms to the left:
285-(135-u)=0
We add all the numbers together, and all the variables
-(-1u+135)+285=0
We get rid of parentheses
1u-135+285=0
We add all the numbers together, and all the variables
u+150=0
We move all terms containing u to the left, all other terms to the right
u=-150
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