7/16+7/16-3/20=
7/16=7*20/16*20=140/320
3/20=3*16/20*16=48/320
140/320+140/320-48/320=232/320=0.725 кг
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7/16+7/16-3/20=
7/16=7*20/16*20=140/320
3/20=3*16/20*16=48/320
140/320+140/320-48/320=232/320=0.725 кг