12/5=3/r

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Solution for 12/5=3/r equation: 


D( r )

r = 0

r = 0

r = 0

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

12/5 = 3/r // - 3/r

12/5-(3/r) = 0

12/5-3*r^-1 = 0

-3*r^-1 = -12/5 // : -3

r^-1 = 4/5

-1 < 0

1/(r^1) = 4/5 // * r^1

1 = 4/5*r^1 // : 4/5

5/4 = r^1

r = 5/4

r = 5/4

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