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157=64-u
We move all terms to the left:
157-(64-u)=0
We add all the numbers together, and all the variables
-(-1u+64)+157=0
We get rid of parentheses
1u-64+157=0
We add all the numbers together, and all the variables
u+93=0
We move all terms containing u to the left, all other terms to the right
u=-93
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