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6=6u+18
We move all terms to the left:
6-(6u+18)=0
We get rid of parentheses
-6u-18+6=0
We add all the numbers together, and all the variables
-6u-12=0
We move all terms containing u to the left, all other terms to the right
-6u=12
u=12/-6
u=-2
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