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248=50-u
We move all terms to the left:
248-(50-u)=0
We add all the numbers together, and all the variables
-(-1u+50)+248=0
We get rid of parentheses
1u-50+248=0
We add all the numbers together, and all the variables
u+198=0
We move all terms containing u to the left, all other terms to the right
u=-198
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