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-1-3u=-19-2u
We move all terms to the left:
-1-3u-(-19-2u)=0
We add all the numbers together, and all the variables
-3u-(-2u-19)-1=0
We get rid of parentheses
-3u+2u+19-1=0
We add all the numbers together, and all the variables
-1u+18=0
We move all terms containing u to the left, all other terms to the right
-u=-18
u=-18/-1
u=+18
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