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20=12u-7u
We move all terms to the left:
20-(12u-7u)=0
We add all the numbers together, and all the variables
-(+5u)+20=0
We get rid of parentheses
-5u+20=0
We move all terms containing u to the left, all other terms to the right
-5u=-20
u=-20/-5
u=+4
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