2.|x-4| = 3x+5
|x-4| = (3x+5):2
TH1:
x-4 = (3x+5):2
x-4-(3x-5) = 2
x-4-3x-5 = 2
x(1-3)+(-4-5) = 2
-2x-9 = 2
-2x = 2+9
-2x = 11
x = 11:(-2)
x = -5,5
TH2:
x-4 = -(3x+5):2
x-4+(3x+5) = 2
x-4+3x+5 = 2
x(1+3)+(-4+5) = 2
4x+1 = 2
4x = 2-1
4x = 1
x = 1:4
x = 0,25
Vậy x = -5,5 hoặc x = 0,25