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Given that x is an integer, prove that if x^2 + 4x - 6 is even, then x is even. You can only use the

Given that x is an integer, prove that if x^2 + 4x - 6 is even, then x is even.

You can only use the definition of even and odd, and you are given integer is closed under addition/subtraction and multiplication, which means integer (+/-/*) integer = integer.

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