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x -szukany drugi bok
x=12*2,25=27
2 MOŻLIWOŚĆ:
x=8*1,5=12
8/12 = 8/x
8x=12*18
8x=216 | :8
x= 27
2. możliwość
8/12 = x/18
12x=18*8
12x=144 | :12
x=12