x-12=5x+9

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Solution for x-12=5x+9 equation: 



x-12=5x+9

We move all terms to the left:

x-12-(5x+9)=0

We get rid of parentheses

x-5x-9-12=0

We add all the numbers together, and all the variables

-4x-21=0

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

-4x=21

x=21/-4

x=-5+1/4

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