21=-2x-7

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Solution for 21=-2x-7 equation: 



21=-2x-7

We move all terms to the left:

21-(-2x-7)=0

We get rid of parentheses

2x+7+21=0

We add all the numbers together, and all the variables

2x+28=0

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

2x=-28

x=-28/2

x=-14

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