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x : 15 = m
x = 15m
y : 15 = n
y = 15n
15m + 15n = 75
m + n = 5
m = 1 n = 4 lub m = 2 n = 3 (m = 3 n = 2 to to samo, więc nie zapisujemy)
x = 15m = 15 * 1 = 15 y = 15n = 15 * 4 = 60
lub
x = 15m = 15 * 2 = 30 y = 15n = 15 * 3 = 45
Te liczby to 15 i 60 lub 30 i 45.