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b - długość krótszego boku prostokąta (szerokość)
2a + 2b = 104
a - 12 = 3b
2a = 104 - 2b
2a = 6b + 24
104 - 2b = 6b + 24
8b = 80
b = 10
a = 3b + 12
a = 42
P = 42 * 10
P = 420
Odp. Pole prostokąta wynosi 420 cm².