-6(0,5х-1,5)-4,5x-8 , при х = 2/3

-6(0,5х-1,5)-4,5x-8 при х = 2/3-6(0,5х-1,5)-4,5x-8-3x+9-4,5x-8-7,5x+1-7,5x+1 при х = 2/3-7,5*2/3+1=-15/2*2/3+1=-5+1=-4