10x-9x=9x+21

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



10x-9x=9x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(9x+21)=0

We get rid of parentheses

x-9x-21=0

We add all the numbers together, and all the variables

-8x-21=0

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

-8x=21

x=21/-8

x=-2+5/8

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