Тетянка 150 (3x + 9) - 12 = 38, 150 (3x + 9) = 38 + 12, 150 (3x + 9) = 50, 3x + 9 = 150: 50, 3x + 9 = 30, 3x = 30 - 9, 3x = 21, x = 21 : 3, x = 7 Наталка 150 (3x + 9) - 12 = 38, (150 (3x + 9) = 38 + 12, 150 (3x + 9) = 50, 3x + 9 = 50 . 150, 3x + 9 = 750, 3x = 750 - 9, 3x = 741, x = 743 : 3, x = 247

Відповідь:

Татьянка 66

Наталка 53