12a-9a+4a-3a=20

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Solution for 12a-9a+4a-3a=20 equation: 



12a-9a+4a-3a=20

We move all terms to the left:

12a-9a+4a-3a-(20)=0

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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