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285=-u+102
We move all terms to the left:
285-(-u+102)=0
We add all the numbers together, and all the variables
-(-1u+102)+285=0
We get rid of parentheses
1u-102+285=0
We add all the numbers together, and all the variables
u+183=0
We move all terms containing u to the left, all other terms to the right
u=-183
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