9+21=-2a

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Solution for 9+21=-2a equation: 



9+21=-2a

We move all terms to the left:

9+21-(-2a)=0

We add all the numbers together, and all the variables

-(-2a)+30=0

We get rid of parentheses

2a+30=0

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

2a=-30

a=-30/2

a=-15

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