After 1 hour he has driven 40 miles
Answer:

Step-by-step explanation:
Given
+ x
Multiply x by
to create a common denominator
=
+ x × 
=
+ 
= 
First, you need to distribute the right side of the equation : 8n - 2
Now the equation is : 20 - 7n = 8n - 2
Add 2 to both sides : 22 - 7n = 8n
Add 7n to both sides : 22 = 15n
Divide both sides by 15 : ( I had to round this one) 1.5 = n
The answer is -5. Hope it helps.