21=3-3x+9

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Solution for 21=3-3x+9 equation: 



21=3-3x+9

We move all terms to the left:

21-(3-3x+9)=0

We add all the numbers together, and all the variables

-(-3x+12)+21=0

We get rid of parentheses

3x-12+21=0

We add all the numbers together, and all the variables

3x+9=0

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

3x=-9

x=-9/3

x=-3

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