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218=158-u
We move all terms to the left:
218-(158-u)=0
We add all the numbers together, and all the variables
-(-1u+158)+218=0
We get rid of parentheses
1u-158+218=0
We add all the numbers together, and all the variables
u+60=0
We move all terms containing u to the left, all other terms to the right
u=-60
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