-4a+20+8a=3a-9a

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Solution for -4a+20+8a=3a-9a equation: 



-4a+20+8a=3a-9a

We move all terms to the left:

-4a+20+8a-(3a-9a)=0

We add all the numbers together, and all the variables

-4a+8a-(-6a)+20=0

We add all the numbers together, and all the variables

4a-(-6a)+20=0

We get rid of parentheses

4a+6a+20=0

We add all the numbers together, and all the variables

10a+20=0

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

10a=-20

a=-20/10

a=-2

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