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x - 1
x = 6h/[5/6] = 7 i 1/5 h [razem]
7 i 1/5 - 6 = 1 i 1/5h [zostało]
6h - 60zł
7 i 1/5 - x zł
x = (60*7 i 1/5)/6 = 72 [zł]