2x=9x-21

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Solution for 2x=9x-21 equation: 



2x=9x-21

We move all terms to the left:

2x-(9x-21)=0

We get rid of parentheses

2x-9x+21=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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