Tentukan himpunan penyelesaiannya |x-1|=|x+3|

|x - 1| = |x + 3|
(f(x) + g(x)) (f(x) - g(x)) = 0
(x - 1 + x + 3) (x - 1 - x - 3) = 0
(2x + 2) (-4) = )
-8x - 8 = 0
-8x = 8
x = -1
HP = {x | x = -1, x elemen bilangan R}