21-(-9)=a

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Solution for 21-(-9)=a equation: 



21-(-9)=a

We move all terms to the left:

21-(-9)-(a)=0

We add all the numbers together, and all the variables

-1a+30=0

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

-a=-30

a=-30/-1

a=+30

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