3·(5 + 0.5х) = 8 - 2.5х
15 + 1,5х = 8 - 2,5х
4х = - 7
х = -7 : 4
х = -1,75
4x^2+8x-x-2<1-4x
4x^2+11x-3<0
D=121+48=169
x1=-11-13/8=-24/8=-4
x2=-11+13/8=1/4