Answer:
Okay I'm not thoroughly understanding your question. But here is my answer for BOTH ways.
Step-by-step explanation:
If it's 5 TIMES 3x/8 +2=7
x= 8/3 or x=2.6
If it's 5(3x) OVER 8 in fraction form +2=7
x= 11
Hope this answers your question.
 
        
             
        
        
        
 Well 23x8=184+184=368 So He Would To Buy 2 Gallons which would be $22
        
             
        
        
        
You divided 3 3 \5 with 2 \9 and you will get your answer 
you also convert 3 3\5 into a fraction
        
             
        
        
        
Hope this helped :)
Check the image below for working