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ilość monet 1 zł = x + 4
5x + 1(x + 4) = 100
5x + x + 4 = 100
6x + 4 = 100 |-4
6x = 96 |:6
x = 16
ilość monet 5 zł = 16
ilość monet 1 zł = 16 + 4 = 20
Odpowiedź: Było 16 monet o wartości 5 zł