2x+6=-7x-21

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



2x+6=-7x-21

We move all terms to the left:

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

We get rid of parentheses

2x+7x+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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