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2x=33
x= 16,5
16,5+12= 28,5
y-ilosc czeresni w mniejszej skrzyni
x+y=45kg
x=y+12
y+12+y=45|-12
2y=33|:2
y=16,5 kg
x=45-16,5=28,5 kg
2x = 45 - 12
2x = 33 /:2
x = 16,5
2x = 28,5
16,5 + 28,5 = 45
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