20=-5(a-4)

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Solution for 20=-5(a-4) equation: 



20=-5(a-4)

We move all terms to the left:

20-(-5(a-4))=0



We calculate terms in parentheses: -(-5(a-4)), so:

-5(a-4)

We multiply parentheses

-5a+20

Back to the equation:

-(-5a+20)



We get rid of parentheses

5a-20+20=0

We add all the numbers together, and all the variables

5a=0

a=0/5

a=0

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