9x+21=10x-10

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



9x+21=10x-10

We move all terms to the left:

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

We get rid of parentheses

9x-10x+10+21=0

We add all the numbers together, and all the variables

-1x+31=0

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

-x=-31

x=-31/-1

x=+31

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