21=-2x-6-7x

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Solution for 21=-2x-6-7x equation: 



21=-2x-6-7x

We move all terms to the left:

21-(-2x-6-7x)=0

We add all the numbers together, and all the variables

-(-9x-6)+21=0

We get rid of parentheses

9x+6+21=0

We add all the numbers together, and all the variables

9x+27=0

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

9x=-27

x=-27/9

x=-3

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