How do i do this? it is an algebraic expression i believe and

You expand it first 10x+55-3x-5
7x+50
answer is C
I hope that`s correct 

First distribute the 5(2x+11), which gives you 10x+55, then subtract (3x+5), the easiest way to solve is turn the negative into a passive and change the following factors, so your equation looks like this:
(10x+55)+(-3x-5)
Then to solve, combine, leaving you with...
7x+50
Then to get x, subtract 50 from both sides then divide by 7
x=-7.14

B. because the 7 represents "seven times", x represents "a number", 12 represents "plus twelve", and -4 represents "minus four"