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...Since x can stand for any real number, we can try to let x = 0 and see if 0 + 3 > 4 is true. It is not, and
therefore the mathematical sentence x + 3 > 4 would not allow x to take on the value 0. 0 is out of our consideration. If x is even less than 0, then since x < 0, x +... (read more)