Answer:
A
Step-by-step explanation:
17 / 12
(12 + 5) / 12
12/12 + 5/12
1 5/12
 
        
             
        
        
        
You have to distribute the 7 to x and 2 so :
7x+14=2x-1
Add one to both sides (inverse operations)
7x+14=2x-1
 +1 +1
7x+15=2x
Cross Cancel by subtracting 7x from both sides 
7x+15=2x
-7x -7x
15=-5x
Divide by -5
15/-5= -5/-5
X= -3
        
             
        
        
        
Answer:

will give you an explanation if you want tag me on comment.
 
        
             
        
        
        
He will have 36 plants next year. 
hope that helped! :)