30=a+9

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Solution for 30=a+9 equation: 



30=a+9

We move all terms to the left:

30-(a+9)=0

We get rid of parentheses

-a-9+30=0

We add all the numbers together, and all the variables

-1a+21=0

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

-a=-21

a=-21/-1

a=+21

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