-20=a+(-17)

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Solution for -20=a+(-17) equation: 



-20=a+(-17)

We move all terms to the left:

-20-(a+(-17))=0



We calculate terms in parentheses: -(a+(-17)), so:

a+(-17)

We add all the numbers together, and all the variables

a-17

Back to the equation:

-(a-17)



We get rid of parentheses

-a+17-20=0

We add all the numbers together, and all the variables

-1a-3=0

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

-a=3

a=3/-1

a=-3

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