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4u+12=6u-8
We move all terms to the left:
4u+12-(6u-8)=0
We get rid of parentheses
4u-6u+8+12=0
We add all the numbers together, and all the variables
-2u+20=0
We move all terms containing u to the left, all other terms to the right
-2u=-20
u=-20/-2
u=+10
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