15c3+2-18c3-c+11+60c4-1;
-3c3+12-c+60c4;
60c4-3c3-c+12-ответ
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15c3+2-18c3-c+11+60c4-1;
-3c3+12-c+60c4;
60c4-3c3-c+12-ответ