= 15х - 6 - 6х - 2 = 9х - 8 = 9*11/9 - 8= 9/1*11/9 - 8 = 11 - 8 = 3
= 15х -6 -6х -2 = 21х - 8 = 21 * 11/9 - 8 = 231 -8 =223