Still working on a test review here, havent seen this one in my home work.

x-9

--- > 0

x+7

x=9 and x=-7

Test it on the number line, end up with

(-(infinity symbol),-7) as well as (9,(infinity symbol))

Normall, I type the UNION symbol in these problems, but the answer is showing OR, so the answer shows:

(-(infinity symbol),-7) OR (9,(infinity symbol))

I don't understand this curve ball.