х1-1 пачка; х2 - 2 пачка
1)x+6/7x=156
x*13/7=156
x=156/13*7
x=84
2)156-84=72
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х1-1 пачка; х2 - 2 пачка
1)x+6/7x=156
x*13/7=156
x=156/13*7
x=84
2)156-84=72