Answer:

Step-by-step explanation:

 
        
                    
             
        
        
        
F=72
g=6
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Therefore:


But what is e?
E=76
G=32
g=6
And:

Which means that:

If you take this value into account, you will discover that f is...

So I would have to say that the answer is approximately (c).
 
        
        
        
(2x-5y)+(x+y)=(2x+x)+(-5y+y)=3x-4y.
therefore: 
(2x-5y)+(x+y)=3x-4y