(d^2r−1dr^2):(17dr)+(16r^3−2dr^2):r^2

d^2r-1dr^2 / 17dr + 16r^3 -2dr^2/ r^2

dr(d-r)/ 17dr + r^2* (16r- 2d)/ r^2

d-r/17 + 16r-2d

d-r+272r -34d /17

-33d+271r/17