2/10=30/x

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Solution for 2/10=30/x equation: 


D( x )

x = 0

x = 0

x = 0

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

2/10 = 30/x // - 30/x

2/10-(30/x) = 0

2/10-30*x^-1 = 0

-30*x^-1 = -1/5 // : -30

x^-1 = 1/150

-1 < 0

1/(x^1) = 1/150 // * x^1

1 = 1/150*x^1 // : 1/150

150 = x^1

x = 150

x = 150

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