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239=50-u
We move all terms to the left:
239-(50-u)=0
We add all the numbers together, and all the variables
-(-1u+50)+239=0
We get rid of parentheses
1u-50+239=0
We add all the numbers together, and all the variables
u+189=0
We move all terms containing u to the left, all other terms to the right
u=-189
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