6x+9=-3x-21=6

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Solution for 6x+9=-3x-21=6 equation: 



6x+9=-3x-21=6

We move all terms to the left:

6x+9-(-3x-21)=0

We get rid of parentheses

6x+3x+21+9=0

We add all the numbers together, and all the variables

9x+30=0

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

9x=-30

x=-30/9

x=-3+1/3

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