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x+x=2x
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x2 + x2 = 2x2 2x^2
-x2 + 2x + 48 = (x +6)(8 - x)
x2 + 2x - 15 = (x - 3)(x + 5)
x2 + 2x - 15 = (x + 5)(x - 3)
x3 - x2 + 2x = x*(x2 - x + 2) which cannot be factored further.