Simplify the sum.
(d^2 - 7d + 12)/(d^2 - d - 6) + (d^2 + 5d + 6)/(d^2 - 2d - 15)
2d^2 - 5d + 24/(d+2)(d-5)
2d^2 - 13d + 24/(d+2)(d-5)
2d^2 + 13d + 24/(d+2)(d-5)
2d^2 + 5d + 24/(d+2)(d-5)
(d^2 - 7d + 12)/(d^2 - d - 6) + (d^2 + 5d + 6)/(d^2 - 2d - 15)
2d^2 - 5d + 24/(d+2)(d-5)
2d^2 - 13d + 24/(d+2)(d-5)
2d^2 + 13d + 24/(d+2)(d-5)
2d^2 + 5d + 24/(d+2)(d-5)