Ответ:
Вариант 1: −20 + 16x = x + 1; 15x = 21, x = 7/5.
Вариант 2: −11x − 3 = 7x; −18x = 3, x = −1/6.
Вариант 3: 8x/7 = −48/7, x = −6.
Вариант 1: −20 + 16x = x + 1; 15x = 21, x = 7/5.
Вариант 2: −11x − 3 = 7x; −18x = 3, x = −1/6.
Вариант 3: 8x/7 = −48/7, x = −6.