\[- 1,25c \cdot 8d = - 10cd\]
\[c = - 1\frac{1}{26};\ \ \ \ \ \ d = 1\frac{4}{9}:\]
\[- 10cd = - 10 \cdot \left( - 1\frac{1}{26} \right) \cdot 1\frac{4}{9} =\]
\[= \frac{10 \cdot 27 \cdot 13}{1 \cdot 26 \cdot 9} = 15.\]