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7(2/7x-5/14y)-4(7/2x-3/8y)
если x=5/6
y=1
ДАЮ 51 БАЛЛ
7(2/7x-5/14y)-4(7/2x-3/8y)
если x=5/6
y=1
ДАЮ 51 БАЛЛ
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7(2/7x-5/14y)-4(7/2x-3/8y)=2x-5y/2-14x+3y/2=-12x-yx=5/6;y=1
-12*5/6-1=-10-1=-11