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D( r )
2*r-9 = 0
3*r+14 = 0
2*r-9 = 0
2*r-9 = 0
2*r-9 = 0 // + 9
2*r = 9 // : 2
r = 9/2
3*r+14 = 0
3*r+14 = 0
3*r+14 = 0 // - 14
3*r = -14 // : 3
r = -14/3
r in (-oo:-14/3) U (-14/3:9/2) U (9/2:+oo)
-4/(2*r-9) = -16/(3*r+14) // + -16/(3*r+14)
-4/(2*r-9)-(-16/(3*r+14)) = 0
16*(3*r+14)^-1-4/(2*r-9) = 0
16/(3*r+14)-4/(2*r-9) = 0
(-4*(3*r+14))/((2*r-9)*(3*r+14))+(16*(2*r-9))/((2*r-9)*(3*r+14)) = 0
16*(2*r-9)-4*(3*r+14) = 0
20*r-200 = 0
(20*r-200)/((2*r-9)*(3*r+14)) = 0
(20*r-200)/((2*r-9)*(3*r+14)) = 0 // * (2*r-9)*(3*r+14)
20*r-200 = 0
20*r-200 = 0 // + 200
20*r = 200 // : 20
r = 200/20
r = 10
r = 10
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