[tex]a) \frac{x}{5} = \frac{12}{15} [/tex]
[tex] \frac{x}{5} = \frac{4}{5} [/tex]
[tex]x = \frac{4 \times 5}{5} [/tex]
[tex]x = 4[/tex]
[tex]b) \frac{x + 2}{x - 5} = \frac{12}{5} [/tex]
[tex]5(x + 2) = 12(x - 5)[/tex]
[tex]5x + 10 = 12x - 60[/tex]
[tex]12x - 5x = 10 + 60[/tex]
[tex]7x = 70[/tex]
[tex]x = \frac{70}{7} [/tex]
[tex]x = 10[/tex]
