1 - (x - 0.3) = 91 - x + 0.3 = 91 + 0.3 - x = 91.3 - x = 9
Проверка:1 - (-7.7 - 0.3) = 1 + 7.7 + 0.3 = 9
Ответ: x = -7.7
1 - (x - 0.3) = 9
x = 9 - 1.3x = 7.71 - x + 0.3 = 9
1 + 0.3 - x = 9
1.3 - x = 9
x = -7.7
Проверка:
1 - (-7.7 - 0.3) = 1 + 7.7 + 0.3 = 9
Ответ: x = -7.7