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-16=2u-4
We move all terms to the left:
-16-(2u-4)=0
We get rid of parentheses
-2u+4-16=0
We add all the numbers together, and all the variables
-2u-12=0
We move all terms containing u to the left, all other terms to the right
-2u=12
u=12/-2
u=-6
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