9a-7=20

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Solution for 9a-7=20 equation: 



9a-7=20

We move all terms to the left:

9a-7-(20)=0

We add all the numbers together, and all the variables

9a-27=0

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

9a=27

a=27/9

a=3

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