140/x=80

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Solution for 140/x=80 equation: 


D( x )

x = 0

x = 0

x = 0

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

140/x = 80 // - 80

140/x-80 = 0

140*x^-1 = 80 // : 140

x^-1 = 4/7

-1 < 0

1/(x^1) = 4/7 // * x^1

1 = 4/7*x^1 // : 4/7

7/4 = x^1

x = 7/4

x = 7/4

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