40/30=10/x

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Solution for 40/30=10/x equation: 


D( x )

x = 0

x = 0

x = 0

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

40/30 = 10/x // - 10/x

40/30-(10/x) = 0

40/30-10*x^-1 = 0

-10*x^-1 = -4/3 // : -10

x^-1 = 2/15

-1 < 0

1/(x^1) = 2/15 // * x^1

1 = 2/15*x^1 // : 2/15

15/2 = x^1

x = 15/2

x = 15/2

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