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293=157-u
We move all terms to the left:
293-(157-u)=0
We add all the numbers together, and all the variables
-(-1u+157)+293=0
We get rid of parentheses
1u-157+293=0
We add all the numbers together, and all the variables
u+136=0
We move all terms containing u to the left, all other terms to the right
u=-136
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