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240=136-u
We move all terms to the left:
240-(136-u)=0
We add all the numbers together, and all the variables
-(-1u+136)+240=0
We get rid of parentheses
1u-136+240=0
We add all the numbers together, and all the variables
u+104=0
We move all terms containing u to the left, all other terms to the right
u=-104
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