Consider this option: 1. to simplify given expression (a-b)/b: [tex] \frac{a-b}{b}= \frac{a}{b}-1;[/tex] 2. to rewrite given expression a/4=b/7: [tex] \frac{a}{b} = \frac{4}{7};[/tex] 3. to substitute a/b into the simplified expression: [tex] \frac{a}{b} -1= \frac{4}{7} -1=- \frac{3}{7};[/tex]
