21=-9-5x

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Solution for 21=-9-5x equation: 



21=-9-5x

We move all terms to the left:

21-(-9-5x)=0

We add all the numbers together, and all the variables

-(-5x-9)+21=0

We get rid of parentheses

5x+9+21=0

We add all the numbers together, and all the variables

5x+30=0

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

5x=-30

x=-30/5

x=-6

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