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216=15-u
We move all terms to the left:
216-(15-u)=0
We add all the numbers together, and all the variables
-(-1u+15)+216=0
We get rid of parentheses
1u-15+216=0
We add all the numbers together, and all the variables
u+201=0
We move all terms containing u to the left, all other terms to the right
u=-201
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