Solve x by simplifying both sides of the equation & then isolating the variable x=-4 & the negative comes in from the -12
Answer:
x∈R
Step-by-step explanation:

2>0
The domain is all real numbers.
x∈R
From x equals five to nine, the y value changes as follows
+10,+2,+1,+3
Assuming that "average" implies the mean, the sum of all four values is 15. Then divide 15 by the four values added = 15/4 = 3 3/4 or 3.75