24/40=3/r

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Solution for 24/40=3/r equation: 


D( r )

r = 0

r = 0

r = 0

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

24/40 = 3/r // - 3/r

24/40-(3/r) = 0

24/40-3*r^-1 = 0

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

r^-1 = 1/5

-1 < 0

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

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

5 = r^1

r = 5

r = 5

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