That doesn't factor neatly. Applying the quadratic formula we find two real solutions: (7 plus or minus the square root of 69) divided by 2.
x = 7.6533119314590374
x = -0.6533119314590374
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x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
x2+7x-8 = (x-1(x+8)
x2+7x-8 = (x-1(x+8)
i got 42 divided 7x
x2-7x+6 = (x-1)(x-6) when factored.