36/42=24/r

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Solution for 36/42=24/r equation: 


D( r )

r = 0

r = 0

r = 0

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

36/42 = 24/r // - 24/r

36/42-(24/r) = 0

36/42-24*r^-1 = 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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