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12=u/4-4
We move all terms to the left:
12-(u/4-4)=0
We get rid of parentheses
-u/4+4+12=0
We multiply all the terms by the denominator
-u+4*4+12*4=0
We add all the numbers together, and all the variables
-1u+64=0
We move all terms containing u to the left, all other terms to the right
-u=-64
u=-64/-1
u=+64
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