=3x
* * * * *
The correct answer is:
x2 + 7x + 12 = (x + 3)(x + 4).
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x2-7x+12 (x-3)(x-4)
x^2 +7x+12 = (x+3)(x+4) when factored
(x + 10)(x - 3)
(x - y + 7)(x + y)
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0