Ответ:
3c^4 - 12с^3 - 2c^4 + 12c^3 - 4с^2 - 9c - с^4=-4c^2 - 9c
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Ответ:
3c^4 - 12с^3 - 2c^4 + 12c^3 - 4с^2 - 9c - с^4=-4c^2 - 9c