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247=-u+35
We move all terms to the left:
247-(-u+35)=0
We add all the numbers together, and all the variables
-(-1u+35)+247=0
We get rid of parentheses
1u-35+247=0
We add all the numbers together, and all the variables
u+212=0
We move all terms containing u to the left, all other terms to the right
u=-212
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