9a-3a-4=20

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Solution for 9a-3a-4=20 equation: 



9a-3a-4=20

We move all terms to the left:

9a-3a-4-(20)=0

We add all the numbers together, and all the variables

6a-24=0

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

6a=24

a=24/6

a=4

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