X-9x+21=12x-7

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Solution for X-9x+21=12x-7 equation: 



X-9X+21=12X-7

We move all terms to the left:

X-9X+21-(12X-7)=0

We add all the numbers together, and all the variables

-8X-(12X-7)+21=0

We get rid of parentheses

-8X-12X+7+21=0

We add all the numbers together, and all the variables

-20X+28=0

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

-20X=-28

X=-28/-20

X=1+2/5

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