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12=5u-u
We move all terms to the left:
12-(5u-u)=0
We add all the numbers together, and all the variables
-(+4u)+12=0
We get rid of parentheses
-4u+12=0
We move all terms containing u to the left, all other terms to the right
-4u=-12
u=-12/-4
u=+3
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