Điền vào chỗ trống: (2x - 6)/(x + 3) + .... = (x + 1)/2

A. $\frac{-{\text{x}}^{\text{2}}+\text{15}}{\text{2(x}+\text{3)}}$

B. $\frac{{\text{x}}^{\text{2}}-\text{15}}{\text{2(x}+\text{3)}}$

C. $\frac{-{\text{x}}^{\text{2}}-\text{15}}{\text{2(x}+\text{3)}}$

D. Cả A, B, C đều sai