That doesn't factor neatly. Using the quadratic formula, we find two real solutions:
(-1 plus or minus the square root of 37) divided by 6
x = 0.8471270883830365
x = -1.18046042171637
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I could factorize : (3 + x) (17 + 3 x) But have no idea about the next part...
3x2-2x-21 = (3x+7)(x-3)
Step 1: 3(x2 + 7x - 44) Step 2: 3(x + 11)(x - 4)
6x(3x2 - x + 4)
3x2 - 9x - 912 = 3(x2 - 3x - 304) = 3(x - 19)(x + 16).