1) |4x+8|=5+3x
16x^2+64x+64=9x^2+30x+25
7x^2+34x+39=0
(7x+13)(x+3)=0 x=-13/7或-3
2) |4x+8|=-5+3x
16x^2+64x+64=9x^2-30x+25
7x^2+94x+39=0
(7x+3)(x+13)=0 x=-7/3或-13