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175=-u+245
We move all terms to the left:
175-(-u+245)=0
We add all the numbers together, and all the variables
-(-1u+245)+175=0
We get rid of parentheses
1u-245+175=0
We add all the numbers together, and all the variables
u-70=0
We move all terms containing u to the left, all other terms to the right
u=70
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