10x+9=21x-12=8x

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Solution for 10x+9=21x-12=8x equation: 



10x+9=21x-12=8x

We move all terms to the left:

10x+9-(21x-12)=0

We get rid of parentheses

10x-21x+12+9=0

We add all the numbers together, and all the variables

-11x+21=0

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

-11x=-21

x=-21/-11

x=1+10/11

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