Find the sum: [tex](3x)/(x ^ 2 - x - 12) + (x + 1)/(2x + 6)[/tex]

A) [tex]((x + 2)(x - 2))/((x - 4)(x + 3))[/tex]

B) [tex](4x + 1)/(2(x - 4)(x + 3))[/tex]

C) [tex](x - 1)/(2(x + 3))[/tex]

D) [tex]((x + 4)(x - 1))/(2(x - 4)(x + 3))[/tex]