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12t+s
b) x tygodni i y dni - ile to godzin?
7·24x+24y=168x+24y
c) a metrów, b centymetrów i c milimetrów - ile to metrów?
a+0,01b+0,001c
d) g godzin i m minut - ile to godzin?
g+m/60