Question

решите уравнение
-1/7x+4=1 8/21
СРОЧНО ​

Answer 1

Ответ:

$- \frac{1}{7} x + 4 = 1 \frac{8}{21} \\ - \frac{1}{7} x + 4 = \frac{29}{21} \\ 21 \times ( - \frac{1}{7} x) +21 \times 4 = 21 \times \frac{29}{21} \\ - 3x + 84 = 29 \\ - 3x = 29 - 89 \\ - 3x = - 55 \\ x = - 55 \div ( - 3) \\ x = \frac{55}{3} = 18 \frac{1}{3}$