0.4=(800-50)/(800-x)

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Solution for 0.4=(800-50)/(800-x) equation: 


D( x )

800-x = 0

800-x = 0

800-x = 0

800-x = 0 // - 800

-x = -800 // * -1

x = 800

x in (-oo:800) U (800:+oo)

0.4 = (800-50)/(800-x) // - (800-50)/(800-x)

0.4-((800-50)/(800-x)) = 0

(-1*750)/(800-x)+0.4 = 0

(-1*750)/(800-x)+(0.4*(800-x))/(800-x) = 0

0.4*(800-x)-1*750 = 0

-0.4*x-430 = 0

(-0.4*x-430)/(800-x) = 0

(-0.4*x-430)/(800-x) = 0 // * 800-x

-0.4*x-430 = 0

-0.4*x-430 = 0 // + 430

-0.4*x = 430 // : -0.4

x = 430/(-0.4)

x = -1075

x = -1075

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