-x+21=2x+9

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



-x+21=2x+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(2x+9)+21=0

We get rid of parentheses

-1x-2x-9+21=0

We add all the numbers together, and all the variables

-3x+12=0

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

-3x=-12

x=-12/-3

x=+4

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