-21+x=9-2x

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



-21+x=9-2x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+2x-9-21=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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