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181=70-u
We move all terms to the left:
181-(70-u)=0
We add all the numbers together, and all the variables
-(-1u+70)+181=0
We get rid of parentheses
1u-70+181=0
We add all the numbers together, and all the variables
u+111=0
We move all terms containing u to the left, all other terms to the right
u=-111
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