Ответ:
4(0,7x+y)-6(4x-y)=2,8x+4y-24x+6y=-21,2x+10y
x=5 y=3,7
(21,2*5)+(10*3,7)=106+37=143
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Ответ:
4(0,7x+y)-6(4x-y)=2,8x+4y-24x+6y=-21,2x+10y
x=5 y=3,7
(21,2*5)+(10*3,7)=106+37=143