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39=-u+178
We move all terms to the left:
39-(-u+178)=0
We add all the numbers together, and all the variables
-(-1u+178)+39=0
We get rid of parentheses
1u-178+39=0
We add all the numbers together, and all the variables
u-139=0
We move all terms containing u to the left, all other terms to the right
u=139
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