1целая 2/3(х-6)-5/9(0.6х-2.7)= при х=0.75

5/3х - 30/3 - 5/9 * 6/10х + 5/9 * 27/10

5/3х -30/3 - 2/6х + 3/2

5/3х - 2/6х - 30/3 + 3/2

10/6х - 2/6х - 60/6 + 9/6

8/6х - 51/6 = 8/6 * 75/100 - 51/6 = 600/600 - 51/6 = 1 - 8,5 = - 7,5