6+7x=-2x-21

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



6+7x=-2x-21

We move all terms to the left:

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

We get rid of parentheses

7x+2x+21+6=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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