Question 17: Find x knowing \(\frac{{ – 3}}{4} = \frac{{x – 3}}{5}\)

\(\begin{aligned}&\frac{{ – 3}}{4} = \frac{{x – 3}}{5}\\ &4.\left( {x – 3} \right) = \left ( { – 3} \right).5\\ &4.\left( {x – 3} \right) = – 15\\ &x – 3 = – \frac{{15}}{4}\\ &x = – \frac{{15}}{4} + 3\\ &x = – \frac{3}{4}\end{aligned} \)