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51=-u+159
We move all terms to the left:
51-(-u+159)=0
We add all the numbers together, and all the variables
-(-1u+159)+51=0
We get rid of parentheses
1u-159+51=0
We add all the numbers together, and all the variables
u-108=0
We move all terms containing u to the left, all other terms to the right
u=108
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