On what signs it is possible to break expressions into two groups? the second class 8+7+5+8, 9+8+8+8, 12+12+12+12, 18+18+18+18

146
In 1) and 2) numbers different, and in 3) and 4) repeat same the First group - the sum different composed: 8+7+5+8 9+8+8+8 second group - the sum identical composed: 12+12+12+12 18+18+18+18
352
Answer add