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251=156-u
We move all terms to the left:
251-(156-u)=0
We add all the numbers together, and all the variables
-(-1u+156)+251=0
We get rid of parentheses
1u-156+251=0
We add all the numbers together, and all the variables
u+95=0
We move all terms containing u to the left, all other terms to the right
u=-95
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