30/14=40/x

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Solution for 30/14=40/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/14 = 40/x // - 40/x

30/14-(40/x) = 0

30/14-40*x^-1 = 0

-40*x^-1 = -15/7 // : -40

x^-1 = 3/56

-1 < 0

1/(x^1) = 3/56 // * x^1

1 = 3/56*x^1 // : 3/56

56/3 = x^1

x = 56/3

x = 56/3

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