a = 0;
0 : 6 = 0 < 14 − ДА;
0 + 28 = 28;
28 * 4 = (20 + 8) * 4 = 20 * 4 + 8 * 4 = 80 + 32 = 112;
x = 112.
 
a = 36;
36 : 6 = 6 < 14 − ДА;
6 + 28 = 34;
34 * 4 = (30 + 4) * 4 = 30 * 4 + 4 * 4 = 120 + 16 = 136;
x = 136.
 
a = 48;
48 : 6 = 8 < 14 − ДА;
8 + 28 = 36;
36 * 4 = (30 + 6) * 4 = 30 * 4 + 6 * 4 = 120 + 24 = 144;
x = 144.
 
a = 60;
60 : 6 = 10 < 14 − ДА;
10 + 28 = 38;
38 * 4 = (30 + 8) * 4 = 30 * 4 + 8 * 4 = 120 + 32 = 152;
x = 152.
 
a = 72;
72 : 6 = (60 + 12) : 6 = 60 : 6 + 12 : 6 = 10 + 2 = 12 < 14 − ДА;
12 + 28 = 40;
40 * 4 = 160;
x = 160.
 
a = 84;
84 : 6 = (60 + 24) : 6 = 60 : 6 + 24 : 6 = 10 + 4 = 14 < 14 − НЕТ;
14 − 8 = 6;
6 * 9 = 54;
x = 54.
 
a = 90;
90 : 6 = (60 + 30) : 6 = 60 : 6 + 30 : 6 = 10 + 5 = 15 < 14 − НЕТ;
15 − 8 = 7;
7 * 9 = 63;
x = 63.
 
a = 120;
120 : 6 = 12 д : 6 = 2 д = 20 < 14 − НЕТ;
20 − 8 = 12;
12 * 9 = (10 + 2) * 9 = 10 * 9 + 2 * 9 = 90 + 18 = 108;
x = 108.
 
a = 240;
240 : 6 = 24 д : 6 = 4 д = 40 < 14 − НЕТ;
40 − 8 = 32;
32 * 9 = (30 + 2) * 9 = 30 * 9 + 2 * 9 = 270 + 18 = 288;
x = 288.
 
a = 600;
600 : 6 = 6 с : 6 = 1 с = 100 < 14 − НЕТ;
100 − 8 = 92;
92 * 9 = (90 + 2) * 9 = 90 * 9 + 2 * 9 = 810 + 18 = 828;
x = 828.
 

Ответ: МИККИ МАУС, ГУФФИ, ВИЛЛИ.