48=-4(4d+20)

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Solution for 48=-4(4d+20) equation: 



48=-4(4d+20)

We move all terms to the left:

48-(-4(4d+20))=0



We calculate terms in parentheses: -(-4(4d+20)), so:

-4(4d+20)

We multiply parentheses

-16d-80

Back to the equation:

-(-16d-80)



We get rid of parentheses

16d+80+48=0

We add all the numbers together, and all the variables

16d+128=0

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

16d=-128

d=-128/16

d=-8

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