X < 8
what this question is saying is that a number, x, can be anything, as long as it is smaller than 8. 
x < 8 represents that this sentence. X could be 7, it could be -1, it could be anything smaller than 8, but it could not be 8 or anything greater than 8.
        
                    
             
        
        
        
1/2x-2/5=3/5       (BTW I got 2/5 by reducing 4/10)
1/2x=7/5             (BTW I got 7/5 by moving 2/5 to the other side)
Then do 7/5 times 2 and you get 14/5
14/5
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4x2=8 then multiply it by 3 to find how much the aquarium can hold which would be 24 of how much water
        
                    
             
        
        
        
X should be 3, 
because 8x means 8 times what number. 
So 8x must be 3. 
8 times 3 = 24. 24 +5 = 29. 
Hope you Understand :) !