help ​

$\frac{-12 + x_2}{2} = -20$

$\frac{13 + y_2}{2} = 14$

$-12 + x_2 = -40 \Rightarrow x_2 = -28$

$13 + y_2 = 28 \Rightarrow y_2 = 15$

$(x_2, y_2) = \boxed{(-28, 15)}$