80/(90-x)=20

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Solution for 80/(90-x)=20 equation: 


D( x )

90-x = 0

90-x = 0

90-x = 0

90-x = 0 // - 90

-x = -90 // * -1

x = 90

x in (-oo:90) U (90:+oo)

80/(90-x) = 20 // - 20

80/(90-x)-20 = 0

80/(90-x)+(-20*(90-x))/(90-x) = 0

80-20*(90-x) = 0

20*x-1720 = 0

(20*x-1720)/(90-x) = 0

(20*x-1720)/(90-x) = 0 // * 90-x

20*x-1720 = 0

20*x-1720 = 0 // + 1720

20*x = 1720 // : 20

x = 1720/20

x = 86

x = 86

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