For $-1 \frac{7}{20}$, multiply 20 by 1 and then add 7 to get 27. The fraction becomes $-\frac{27}{20}$. For $2 \frac{11}{12}$, multiply 12 by 2 and then add 11 to get 35. The fraction becomes $\frac{35}{12}$.
So, the equation becomes $-\frac{27}{20} \cdot
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