Try this solution (see the attachment, it is consists of 3 steps).
Answer:
-3
Step-by-step explanation:
Yes subtracting is taking away from another. 5-3 is two because you take 3 away from 5.
Answer:
B.) 
Step-by-step explanation:

A negative and a negative equals a positive. Remove parentheses and simplify

Done.
<span>the blank boxes are for you to plug in x=20 to prove its right.
so it would be
3(20)-4=2(20+8)
60-4=2(28)
56=56
so its true!</span>