-2x=21-9x

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



-2x=21-9x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-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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