6 + 4х - 9 + 12х =
14х - 8х + 2 - 7 =
26а - 4b - 6a + 3b =
24 + 6х - 13х - 8 =
29х - 40х + 47 - 12 =
-13 + 15х - 8 + 5х =
-11х + 14х - 7 + 23 =
-100 + 45 + 21х -9х =
-16х - 9 + 24х + 5 =
-14b + 13a - 9b + 6a =
-16x + 21y + 4x -5y =