28/40=6/x

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Solution for 28/40=6/x equation: 


D( x )

x = 0

x = 0

x = 0

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

28/40 = 6/x // - 6/x

28/40-(6/x) = 0

28/40-6*x^-1 = 0

-6*x^-1 = -7/10 // : -6

x^-1 = 7/60

-1 < 0

1/(x^1) = 7/60 // * x^1

1 = 7/60*x^1 // : 7/60

60/7 = x^1

x = 60/7

x = 60/7

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