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75%-30zł
75%=3/4
30zł:3/4=30zł*4/3=120/3zł=40zł
odp.początkowa cena bluzki wynosiła 40zł
x - 25% * x = 30
x - 1/4x = 30
3/4x = 30 /*4/3
x = 10 * 4
x = 40
Początkowa cena bluzki wynosi 40 zł.