Question

Помогите пожалуйста !

Answer 1

$x - \frac{x}{7} - \frac{15}{7} = 0 \\ \frac{7x - x - 15}{7} = 0 \\ 6x - 15 = 0 \\ 6x = 15 \\ x = \frac{15}{6} = \frac{5}{2} = 2.5$