Question

Решыть уровнение с проверкой 27-x*7=20

Answer 1

$27 - 7x = 20 \\ 7x = 27 - 20 \\ 7x = 7 \\ x = 7 \div 7 \\ x = 1$

Проверка:

$27 - 1 \times 7 = 20 \\ 27 - 7 = 20 \\ 20 = 20$