17(3c+5d)+6c-28d при c+d=2
17(3c+5d)+6c-28d =51с+85д+6с-28д=57с+57д=57(с+д)
при с+д=2
57*2=114
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17(3c+5d)+6c-28d =51с+85д+6с-28д=57с+57д=57(с+д)
при с+д=2
57*2=114