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6u=12+2u
We move all terms to the left:
6u-(12+2u)=0
We add all the numbers together, and all the variables
6u-(2u+12)=0
We get rid of parentheses
6u-2u-12=0
We add all the numbers together, and all the variables
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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