2x-9=x-21

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



2x-9=x-21

We move all terms to the left:

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

We get rid of parentheses

2x-x+21-9=0

We add all the numbers together, and all the variables

x+12=0

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

x=-12

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