-20=7a+3a

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



-20=7a+3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+10a)-20=0

We get rid of parentheses

-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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