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