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7b * 8 = 7
56b = 7
b = 7/56 = 1/8
sprawdzenie
7 * 1/8 = 7/8
7/8 = 7/8
L = P
b=7/8 * 1/7
b= 7/56 ===> 1/8
sprawdzenie:
7 * 1/8 =7/8