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Best Answer
x + x2 = 6
So x2 + x - 6 = 0
x2 + 3x - 2x - 6 = 0
x(x + 3) - 2(x + 3) = 0
(x + 3)(x - 2) = 0
So x + 3 = 0 so that x = -3
or x - 2 = 0 so that x = 2
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