$$ \frac{4^7 \cdot (4^3)^7}{(4^2)^7 \cdot 4^{12}} = \frac{4^7 \cdot 4^{3\cdot7}}{4^{2\cdot7} \cdot 4^{12}} = \frac{4^7 \cdot 4^{21}}{4^{14} \cdot 4^{12}} = \frac{4^{7+21}}{4^{14+12}} = \frac{4^{28}}{4^{26}} = 4^{28-26} = 4^2 = 16 $$
Ответ: 16