12+3u=9u+18

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Solution for 12+3u=9u+18 equation: 



12+3u=9u+18

We move all terms to the left:

12+3u-(9u+18)=0

We get rid of parentheses

3u-9u-18+12=0

We add all the numbers together, and all the variables

-6u-6=0

We move all terms containing u to the left, all other terms to the right

-6u=6

u=6/-6

u=-1

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