|x2-7x+12| = 7x-8-x2

|x²-7x+12| = 7x-8-x²

x²-7x+12 = ±(7x-8-x²)

x²-7x+12 = -(7x-8-x²) или x²-7x+12 = 7x-8-x²

x²-7x+12 = -7x+8+x² или x²-7x+12 = 7x-8-x²

12 = 8 или 2x²-14x+20 = 0

реш. нет x²-7x+10 = 0

х=2, х=5

Ответ: 2; 5.