4(m-4)+7m=-93 what is m? and how do i get the answer?

Someone me i need with this stuff

How do i put 3(x+7) in distributive property

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )