21x-12=10x+9

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



21x-12=10x+9

We move all terms to the left:

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

We get rid of parentheses

21x-10x-9-12=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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