20=-4(3a-4)

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Solution for 20=-4(3a-4) equation: 



20=-4(3a-4)

We move all terms to the left:

20-(-4(3a-4))=0



We calculate terms in parentheses: -(-4(3a-4)), so:

-4(3a-4)

We multiply parentheses

-12a+16

Back to the equation:

-(-12a+16)



We get rid of parentheses

12a-16+20=0

We add all the numbers together, and all the variables

12a+4=0

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

12a=-4

a=-4/12

a=-1/3

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