3/1.5=18/x

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Solution for 3/1.5=18/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/1.5 = 18/x // - 18/x

3/1.5-(18/x) = 0

3/1.5-18*x^-1 = 0

-18*x^-1 = -2 // : -18

x^-1 = 1/9

-1 < 0

1/(x^1) = 1/9 // * x^1

1 = 1/9*x^1 // : 1/9

9 = x^1

x = 9

x = 9

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