Chọn câu sai? (11x + 13)/(3x - 3) + (15x + 17)/(4 - 4x) = -1/12

A. $\frac{\text{11x}+\text{13}}{\text{3x}-\text{3}}+\frac{\text{15x}+\text{17}}{\text{4}-\text{4x}}=\frac{-\text{1}}{\text{12}}$

B. $\frac{\text{11x}+\text{13}}{\text{3x}-\text{3}}+\frac{\text{15x}+\text{17}}{\text{4}-\text{4x}}=\frac{-\text{x}-\text{1}}{\text{12(x}-\text{1)}}$

C. $\frac{\text{xy}}{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}-\frac{{\text{x}}^{\text{2}}}{{\text{y}}^{\text{2}}-{\text{x}}^{\text{2}}}=\frac{\text{x}}{\text{x}-\text{y}}$

D. $\frac{\text{xy}}{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}-\frac{{\text{x}}^{\text{2}}}{{\text{y}}^{\text{2}}-{\text{x}}^{\text{2}}}=\frac{-\text{x}}{\text{y}-\text{x}}$