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19-13u=9u-17-19u
We move all terms to the left:
19-13u-(9u-17-19u)=0
We add all the numbers together, and all the variables
-13u-(-10u-17)+19=0
We get rid of parentheses
-13u+10u+17+19=0
We add all the numbers together, and all the variables
-3u+36=0
We move all terms containing u to the left, all other terms to the right
-3u=-36
u=-36/-3
u=+12
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