24/r=18/21

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Solution for 24/r=18/21 equation: 


D( r )

r = 0

r = 0

r = 0

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

24/r = 18/21 // - 18/21

24/r-(18/21) = 0

24/r-6/7 = 0

24*r^-1 = 6/7 // : 24

r^-1 = 1/28

-1 < 0

1/(r^1) = 1/28 // * r^1

1 = 1/28*r^1 // : 1/28

28 = r^1

r = 28

r = 28

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