1/2=90/x

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Solution for 1/2=90/x equation: 


D( x )

x = 0

x = 0

x = 0

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

1/2 = 90/x // - 90/x

1/2-(90/x) = 0

1/2-90*x^-1 = 0

-90*x^-1 = -1/2 // : -90

x^-1 = 1/180

-1 < 0

1/(x^1) = 1/180 // * x^1

1 = 1/180*x^1 // : 1/180

180 = x^1

x = 180

x = 180

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