2-x-9=x-21

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Solution for 2-x-9=x-21 equation: 



2-x-9=x-21

We move all terms to the left:

2-x-9-(x-21)=0

We add all the numbers together, and all the variables

-1x-(x-21)-7=0

We get rid of parentheses

-1x-x+21-7=0

We add all the numbers together, and all the variables

-2x+14=0

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

-2x=-14

x=-14/-2

x=+7

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