6/27=4/r

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Solution for 6/27=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

6/27 = 4/r // - 4/r

6/27-(4/r) = 0

6/27-4*r^-1 = 0

-4*r^-1 = -2/9 // : -4

r^-1 = 1/18

-1 < 0

1/(r^1) = 1/18 // * r^1

1 = 1/18*r^1 // : 1/18

18 = r^1

r = 18

r = 18

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