Question

4. Решите уравнение: 15 - (x + 1 ) - 10​

Answer 1

$\frac{15}{20} - (x + \frac{1}{20} ) = \frac{4}{20} \\ \frac{15}{20} - x - \frac{1}{20} - \frac{4}{20} = 0 \\ \frac{15 - 20x - 1 - 4}{20} = 0 \\ \frac{10 - 20x}{20} = 0 \\ 10 - 20x = 0 \\ - 20x = - 10 \\ x = \frac{ - 10}{ - 20} \\ x = \frac{1}{2}$