= 3(2-х)/2(7-y) * (7-y)/5(x-2)= 3(2-x)/2*5*(x-2)= - 3*(x-2)/10*(x-2)= -3/10
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= 3(2-х)/2(7-y) * (7-y)/5(x-2)= 3(2-x)/2*5*(x-2)= - 3*(x-2)/10*(x-2)= -3/10