tentukan himpuanan penyelesaian dari |x-7|=|x+1|

Ix - 7I = Ix + 1I
(x - 7)² = (x + 1)²
(x - 7)² - (x + 1)² = 0
(x - 7 + x + 1)(x - 7 - x - 1) = 0
(2x - 6)(-8) = 0

2x - 6 = 0
2x = 6
x = 3

HP = {3}