-6(0.5x-1.5)-4.5x-8 при x=2/3

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