12x - 2xy = 2x(6-y) = 2 * 3 * (6 - (-5)) = 6 * 11 = 66
12x-2xy (при x= 3 и y= -5):
12*3-2*3*(-5)=36+30=66
12x - 2xy = 2x(6-y) = 2 * 3 * (6 - (-5)) = 6 * 11 = 66
12x-2xy (при x= 3 и y= -5):
12*3-2*3*(-5)=36+30=66