0
x2 + x = 6, therefore x2 + x - 6 = 0
This can be factored : x2 + x - 6 = (x + 3)(x - 2) = 0
This equation holds true when x + 3 = 0 or x - 2 = 0.
When x + 3 = 0 then x = -3 : When x - 2 = 0 then x = 2
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