7 - 2 (3 - 8x)
7 - 6 + 16x
1 + 16x
Nothing further can be simplified. 
 
        
             
        
        
        
Answer:
x=2
Step-by-step explanation:
divide -5 to both sides to isolate the x. two negatives make a positive therefore x=2.
i hope this helps :)
 
        
                    
             
        
        
        
45 _____________________\_
        
             
        
        
        
Answer:
-151
Step-by-step explanation:
first find the value of g(6)
g(6) = -3 × 6 - 8 ➡-24 
then put this value fir f(g(6))
f(-24) = 6 × -24 -7 ➡ -151