21=-5x-7

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Solution for 21=-5x-7 equation: 



21=-5x-7

We move all terms to the left:

21-(-5x-7)=0

We get rid of parentheses

5x+7+21=0

We add all the numbers together, and all the variables

5x+28=0

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

5x=-28

x=-28/5

x=-5+3/5

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