-5a+20+2a=9a-7a

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Solution for -5a+20+2a=9a-7a equation: 



-5a+20+2a=9a-7a

We move all terms to the left:

-5a+20+2a-(9a-7a)=0

We add all the numbers together, and all the variables

-5a+2a-(+2a)+20=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-3a-2a+20=0

We add all the numbers together, and all the variables

-5a+20=0

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

-5a=-20

a=-20/-5

a=+4

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