15/12=21/x

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Solution for 15/12=21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

15/12 = 21/x // - 21/x

15/12-(21/x) = 0

15/12-21*x^-1 = 0

-21*x^-1 = -5/4 // : -21

x^-1 = 5/84

-1 < 0

1/(x^1) = 5/84 // * x^1

1 = 5/84*x^1 // : 5/84

84/5 = x^1

x = 84/5

x = 84/5

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