72/8=80/x

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Solution for 72/8=80/x equation: 


D( x )

x = 0

x = 0

x = 0

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

72/8 = 80/x // - 80/x

72/8-(80/x) = 0

72/8-80*x^-1 = 0

-80*x^-1 = -9 // : -80

x^-1 = 9/80

-1 < 0

1/(x^1) = 9/80 // * x^1

1 = 9/80*x^1 // : 9/80

80/9 = x^1

x = 80/9

x = 80/9

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