A-a+3a-2a+3a=20

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Solution for A-a+3a-2a+3a=20 equation: 



-A+3A-2A+3A=20

We move all terms to the left:

-A+3A-2A+3A-(20)=0

We add all the numbers together, and all the variables

3A-20=0

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

3A=20

A=20/3

A=6+2/3

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