7a-9a=-20

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Solution for 7a-9a=-20 equation: 



7a-9a=-20

We move all terms to the left:

7a-9a-(-20)=0

We add all the numbers together, and all the variables

-2a+20=0

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

-2a=-20

a=-20/-2

a=+10

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