12+9+x=3x-9

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Solution for 12+9+x=3x-9 equation: 



12+9+x=3x-9

We move all terms to the left:

12+9+x-(3x-9)=0

We add all the numbers together, and all the variables

x-(3x-9)+21=0

We get rid of parentheses

x-3x+9+21=0

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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