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197=117-u
We move all terms to the left:
197-(117-u)=0
We add all the numbers together, and all the variables
-(-1u+117)+197=0
We get rid of parentheses
1u-117+197=0
We add all the numbers together, and all the variables
u+80=0
We move all terms containing u to the left, all other terms to the right
u=-80
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