5x + 15 = 5(x + 3)
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5(x + 3)
Since 5x + 20 is a multiple of x + 4, it is automatically the LCD of this problem.
x2 - 5x + 6 = (x - 2)(x - 3)
x2+5x-14 = (x+7)(x-2) when factored
6x2 + 5x - 6 is factored out to (2x + 3)(3x - 2).