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12u=4u+16
We move all terms to the left:
12u-(4u+16)=0
We get rid of parentheses
12u-4u-16=0
We add all the numbers together, and all the variables
8u-16=0
We move all terms containing u to the left, all other terms to the right
8u=16
u=16/8
u=2
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