9x-21=10x-31

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Solution for 9x-21=10x-31 equation: 



9x-21=10x-31

We move all terms to the left:

9x-21-(10x-31)=0

We get rid of parentheses

9x-10x+31-21=0

We add all the numbers together, and all the variables

-1x+10=0

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

-x=-10

x=-10/-1

x=+10

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