-2a+20+7a=3a-8a

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Solution for -2a+20+7a=3a-8a equation: 



-2a+20+7a=3a-8a

We move all terms to the left:

-2a+20+7a-(3a-8a)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

5a+5a+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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