280=920(1-d)

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Solution for 280=920(1-d) equation: 



280=920(1-d)

We move all terms to the left:

280-(920(1-d))=0

We add all the numbers together, and all the variables

-(920(-1d+1))+280=0



We calculate terms in parentheses: -(920(-1d+1)), so:

920(-1d+1)

We multiply parentheses

-920d+920

Back to the equation:

-(-920d+920)



We get rid of parentheses

920d-920+280=0

We add all the numbers together, and all the variables

920d-640=0

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

920d=640

d=640/920

d=16/23

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