18/20=90/x

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Solution for 18/20=90/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18/20 = 90/x // - 90/x

18/20-(90/x) = 0

18/20-90*x^-1 = 0

-90*x^-1 = -9/10 // : -90

x^-1 = 1/100

-1 < 0

1/(x^1) = 1/100 // * x^1

1 = 1/100*x^1 // : 1/100

100 = x^1

x = 100

x = 100

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