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8u=18+6u
We move all terms to the left:
8u-(18+6u)=0
We add all the numbers together, and all the variables
8u-(6u+18)=0
We get rid of parentheses
8u-6u-18=0
We add all the numbers together, and all the variables
2u-18=0
We move all terms containing u to the left, all other terms to the right
2u=18
u=18/2
u=9
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