16/20=72/x

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Solution for 16/20=72/x equation: 


D( x )

x = 0

x = 0

x = 0

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

16/20 = 72/x // - 72/x

16/20-(72/x) = 0

16/20-72*x^-1 = 0

-72*x^-1 = -4/5 // : -72

x^-1 = 1/90

-1 < 0

1/(x^1) = 1/90 // * x^1

1 = 1/90*x^1 // : 1/90

90 = x^1

x = 90

x = 90

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