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239=-u+11
We move all terms to the left:
239-(-u+11)=0
We add all the numbers together, and all the variables
-(-1u+11)+239=0
We get rid of parentheses
1u-11+239=0
We add all the numbers together, and all the variables
u+228=0
We move all terms containing u to the left, all other terms to the right
u=-228
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