9x-12=10x+9

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Solution for 9x-12=10x+9 equation: 



9x-12=10x+9

We move all terms to the left:

9x-12-(10x+9)=0

We get rid of parentheses

9x-10x-9-12=0

We add all the numbers together, and all the variables

-1x-21=0

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

-x=21

x=21/-1

x=-21

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