9a-2a+3(-a-4)=20

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Solution for 9a-2a+3(-a-4)=20 equation: 



9a-2a+3(-a-4)=20

We move all terms to the left:

9a-2a+3(-a-4)-(20)=0

We add all the numbers together, and all the variables

9a-2a+3(-1a-4)-20=0

We add all the numbers together, and all the variables

7a+3(-1a-4)-20=0

We multiply parentheses

7a-3a-12-20=0

We add all the numbers together, and all the variables

4a-32=0

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

4a=32

a=32/4

a=8

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