3x^3 - x^2 - 147x + 49 = 0
a little inspection and rearranging yields
3x^3-147x - x^2+49
3x(x^2-49) - (x^2-49)
(3x-1)(x+7)(x-7)
Factor the following. 3x^3+49=x^2+147x
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