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64=4u-12
We move all terms to the left:
64-(4u-12)=0
We get rid of parentheses
-4u+12+64=0
We add all the numbers together, and all the variables
-4u+76=0
We move all terms containing u to the left, all other terms to the right
-4u=-76
u=-76/-4
u=+19
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