I'm really confused with a question on a maths past paper, and was wondering if anyone could help me with it. I think this should be a question, not a discussion, but the question thingy isn't working for me :( Anyway, here is the question:

show that 9+11/x+2 = 28/x(x+2) simplifies to 9xsquared+29x-28=0

the mark scheme says:
9x(x + 2) + 11x

9x(x + 2) + 11x = 2

9x
2
+ 18x + 11x = 28

but I cant understand how that works with the 11 becoming 11x and the 9 getting x(x+2)