6x+9=-21-6x

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



6x+9=-21-6x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x+6x+21+9=0

We add all the numbers together, and all the variables

12x+30=0

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

12x=-30

x=-30/12

x=-2+1/2

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