Factoring involves 'factoring out' the common numbers for each term. In a simple general form, a + ab = a(1+b).
It's like "undistributing" factors: instead of multiplying both terms by a number, you essentially divide both terms by a number.
In (7x + 49), both terms - 7x and 49 - have 7 as a factor. So, it can also be written:
7x + 49 = 7(x+7)
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-7
x2 + 7x + 6 = (x + 6) (x + 1)
10 + 9x
-7x + 6 + 7x - 2 = 4
If you mean: 7x = 49 then the value of x is 7