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-9u-13=19-7u
We move all terms to the left:
-9u-13-(19-7u)=0
We add all the numbers together, and all the variables
-9u-(-7u+19)-13=0
We get rid of parentheses
-9u+7u-19-13=0
We add all the numbers together, and all the variables
-2u-32=0
We move all terms containing u to the left, all other terms to the right
-2u=32
u=32/-2
u=-16
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