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-15u+19=-17+u-18u
We move all terms to the left:
-15u+19-(-17+u-18u)=0
We add all the numbers together, and all the variables
-15u-(-17u-17)+19=0
We get rid of parentheses
-15u+17u+17+19=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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