The original price for one lunch special is $19.
Step-by-step explanation
The original price for one lunch special is 'p' dollar.
He wins a coupon for $4 off for each of five days. That means , he needs to pay
dollar each day.
So, the total amount needed to pay for 5 days
dollar
Given that, he pays $75 for his 5 lunch specials. So the equation will be.....

So, the original price for one lunch special is $19.