-20=a/(-4)

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Solution for -20=a/(-4) equation: 



-20=a/(-4)

We move all terms to the left:

-20-(a/(-4))=0

We multiply all the terms by the denominator


-(a-20*(-4))=0



We calculate terms in parentheses: -(a-20*(-4)), so:

a-20*(-4)

We add all the numbers together, and all the variables

a+80

Back to the equation:

-(a+80)



We get rid of parentheses

-a-80=0

We add all the numbers together, and all the variables

-1a-80=0

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

-a=80

a=80/-1

a=-80

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