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-16=-2u-2u
We move all terms to the left:
-16-(-2u-2u)=0
We add all the numbers together, and all the variables
-(-4u)-16=0
We get rid of parentheses
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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