If f(x) = x2 - 2x and g(x) = 6x + 4, for which value of x does (f + g)(x) = 0?

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Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?