75/90=12/r

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Solution for 75/90=12/r equation: 


D( r )

r = 0

r = 0

r = 0

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

75/90 = 12/r // - 12/r

75/90-(12/r) = 0

75/90-12*r^-1 = 0

-12*r^-1 = -5/6 // : -12

r^-1 = 5/72

-1 < 0

1/(r^1) = 5/72 // * r^1

1 = 5/72*r^1 // : 5/72

72/5 = r^1

r = 72/5

r = 72/5

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