0.5-5(4-2.3x)=15.4x+8
0.5-5*(4-2.3x)=15.4x+8 0.5-20+11.5x=15.4x+8 -19.5+11.5x=15.4x+8 11.5x-15.4x=8+19.5 -3.9x=27.5 3.9x=-27.5 x= (-27.5) : 3,9 х= -7 2/39