12=21x+21+15-9x

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Solution for 12=21x+21+15-9x equation: 



12=21x+21+15-9x

We move all terms to the left:

12-(21x+21+15-9x)=0

We add all the numbers together, and all the variables

-(12x+36)+12=0

We get rid of parentheses

-12x-36+12=0

We add all the numbers together, and all the variables

-12x-24=0

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

-12x=24

x=24/-12

x=-2

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