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-15u+20=-12-17u-2
We move all terms to the left:
-15u+20-(-12-17u-2)=0
We add all the numbers together, and all the variables
-15u-(-17u-14)+20=0
We get rid of parentheses
-15u+17u+14+20=0
We add all the numbers together, and all the variables
2u+34=0
We move all terms containing u to the left, all other terms to the right
2u=-34
u=-34/2
u=-17
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