7a-9=-30

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Solution for 7a-9=-30 equation: 



7a-9=-30

We move all terms to the left:

7a-9-(-30)=0

We add all the numbers together, and all the variables

7a+21=0

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

7a=-21

a=-21/7

a=-3

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