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-12-10u=-20-19u
We move all terms to the left:
-12-10u-(-20-19u)=0
We add all the numbers together, and all the variables
-10u-(-19u-20)-12=0
We get rid of parentheses
-10u+19u+20-12=0
We add all the numbers together, and all the variables
9u+8=0
We move all terms containing u to the left, all other terms to the right
9u=-8
u=-8/9
u=-8/9
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