5mx-4by+4my-5=5(mx-1)-4y(b-m)
при m=9, b=8, x= -6, y=7
5*(9*(-6) - 1) - 4*7*(8 - 9)=5*(-53) - 28*( - 1)= - 265+28= - 237
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5mx-4by+4my-5=5(mx-1)-4y(b-m)
при m=9, b=8, x= -6, y=7
5*(9*(-6) - 1) - 4*7*(8 - 9)=5*(-53) - 28*( - 1)= - 265+28= - 237