20=100/x-5

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Solution for 20=100/x-5 equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

20 = 100/x-5 // - 100/x-5

5-(100/x)+20 = 0

5-100*x^-1+20 = 0

-100*x^-1 = -25 // : -100

x^-1 = 1/4

-1 < 0

1/(x^1) = 1/4 // * x^1

1 = 1/4*x^1 // : 1/4

4 = x^1

x = 4

x = 4

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