8x-2y+12x+8y-24x-12y=-4x-6y
при x=2, y=-2;
-4*2-6*(-2)=-8+12=4
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8x-2y+12x+8y-24x-12y=-4x-6y
при x=2, y=-2;
-4*2-6*(-2)=-8+12=4
-4х-6у
-4×2-6×-2=4