5x+21=-2x-7

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Solution for 5x+21=-2x-7 equation: 



5x+21=-2x-7

We move all terms to the left:

5x+21-(-2x-7)=0

We get rid of parentheses

5x+2x+7+21=0

We add all the numbers together, and all the variables

7x+28=0

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

7x=-28

x=-28/7

x=-4

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