-31=-20+a

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Solution for -31=-20+a equation: 



-31=-20+a

We move all terms to the left:

-31-(-20+a)=0

We add all the numbers together, and all the variables

-(a-20)-31=0

We get rid of parentheses

-a+20-31=0

We add all the numbers together, and all the variables

-1a-11=0

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

-a=11

a=11/-1

a=-11

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