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220=140-u
We move all terms to the left:
220-(140-u)=0
We add all the numbers together, and all the variables
-(-1u+140)+220=0
We get rid of parentheses
1u-140+220=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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