Question 18: Find the integers y known :\(\frac{{ – 5}}{y}{\rm{ = }}\frac{{20}}{{28}}\)

We have y non-zero: \(\begin{array}{l} \frac{{ – 5}}{y}{\rm{ = }}\frac{{20}}{{28}} \Leftrightarrow – 5.28 = {\rm{ y }}{\rm{.20}} \Leftrightarrow {\rm{y}}{\rm{.20}} = – 140\\ \Rightarrow y = – 140:{\rm{ }}20{\rm{ = – }}7 \end{array}\)