7. Two old friends met after many years of separation. One of them - Zbyszek said that he has 3 sons and the product of their age and the sum is the number of windows of the house that they were looking at. The second man - Maciek tried to count it but he sais that he can't tell how many years each of the sons is. Than Zbyszek said that the oldest son has got a red hair and Maciek gave the ages of Zbyszek's sons. How many years is each of the sons?
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