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20+17u=-16+15u
We move all terms to the left:
20+17u-(-16+15u)=0
We add all the numbers together, and all the variables
17u-(15u-16)+20=0
We get rid of parentheses
17u-15u+16+20=0
We add all the numbers together, and all the variables
2u+36=0
We move all terms containing u to the left, all other terms to the right
2u=-36
u=-36/2
u=-18
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