8/20=18/x

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Solution for 8/20=18/x equation: 


D( x )

x = 0

x = 0

x = 0

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

8/20 = 18/x // - 18/x

8/20-(18/x) = 0

8/20-18*x^-1 = 0

-18*x^-1 = -2/5 // : -18

x^-1 = 1/45

-1 < 0

1/(x^1) = 1/45 // * x^1

1 = 1/45*x^1 // : 1/45

45 = x^1

x = 45

x = 45

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