7a+3a-2-a=20

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Solution for 7a+3a-2-a=20 equation: 



7a+3a-2-a=20

We move all terms to the left:

7a+3a-2-a-(20)=0

We add all the numbers together, and all the variables

9a-22=0

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

9a=22

a=22/9

a=2+4/9

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