21/5=63/x

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Solution for 21/5=63/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/5 = 63/x // - 63/x

21/5-(63/x) = 0

21/5-63*x^-1 = 0

-63*x^-1 = -21/5 // : -63

x^-1 = 1/15

-1 < 0

1/(x^1) = 1/15 // * x^1

1 = 1/15*x^1 // : 1/15

15 = x^1

x = 15

x = 15

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