1/3=4/r

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Solution for 1/3=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

1/3 = 4/r // - 4/r

1/3-(4/r) = 0

1/3-4*r^-1 = 0

-4*r^-1 = -1/3 // : -4

r^-1 = 1/12

-1 < 0

1/(r^1) = 1/12 // * r^1

1 = 1/12*r^1 // : 1/12

12 = r^1

r = 12

r = 12

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