tlng bantu y kak tentukan hp dr soal ini (3x-1)=(x+7)

(3x - 1) = (x + 7)
(3x - 1) - (x + 7) = 0
3x - 1 - x - 7 = 0
3x -x -1 -7= 0
2x - 8 = 0
2(x -4) = 0
x - 4 = 0
x = 4

Materi : Nilai Mutlak
Kelas : X SMA

I3x - 1I = Ix + 7I
I3x - 1I^2 = Ix + 7I^2
9x^2 - 6x + 1 = x^2 + 14x + 49
9x^2 - x^2 - 6x - 14x + 1 - 49 = 0
8x^2 - 20x - 48 = 0
----------------------------- : 4
2x^2 - 5x - 12 = 0
(2x + 3) ( x - 4) = 0

2x + 3 = 0
2x = -3
x = -3/2

x - 4 = 0
x = 4

Hp = { -3/2 , 4 }