Question 77321
If you're trying to combine like terms then:

{{{x(x-7) + 9(x-7)}}} Since we have like terms of (x-7) we can combine these terms. If we let y=x-7 we get

{{{xy + 9y}}} Now we can see the combination easier

{{{(x+9)y}}}

{{{(x+9)(x-7)}}} replace y with x-7. This is the factored form