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-16u-3=-19-12u
We move all terms to the left:
-16u-3-(-19-12u)=0
We add all the numbers together, and all the variables
-16u-(-12u-19)-3=0
We get rid of parentheses
-16u+12u+19-3=0
We add all the numbers together, and all the variables
-4u+16=0
We move all terms containing u to the left, all other terms to the right
-4u=-16
u=-16/-4
u=+4
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