6a-9+3a=20

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Solution for 6a-9+3a=20 equation: 



6a-9+3a=20

We move all terms to the left:

6a-9+3a-(20)=0

We add all the numbers together, and all the variables

9a-29=0

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

9a=29

a=29/9

a=3+2/9

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