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per on the portal and within ti ysical system satisfies the syste aD-x + 6Dy = 4 aD-v -BDx = 0 of x and y in term of t, given s the non-zero digits of your re itains two zero then you can ta body is at an unknown temp nstant temperature of 30 F. If and after 20 minutes the temp ind the unknown initial tempe