14/21=42/r

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Solution for 14/21=42/r equation: 


D( r )

r = 0

r = 0

r = 0

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

14/21 = 42/r // - 42/r

14/21-(42/r) = 0

14/21-42*r^-1 = 0

-42*r^-1 = -2/3 // : -42

r^-1 = 1/63

-1 < 0

1/(r^1) = 1/63 // * r^1

1 = 1/63*r^1 // : 1/63

63 = r^1

r = 63

r = 63

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