Answer:
The answer is 20 and it represents the monthly fee.
Step-by-step explanation:
1/18
x = negative 9/4
-2x-11=6x+7
-2x-11+11=6x+7+11
-2x=6x+18
-2x-6x=6x+18-6x
-8x=18
9.1
....................
n = 3m
H
24 x 1 1/4