Question 9373
Do the work!
Come on, what is the sum of 3.0 and 5.0? Write that answer down.
What is the product of 3.0 and 5.0? The product is the result of multiplying the two numbers together. Write that answer down.
What is the difference between those two numbers? 
In algebraic terms this would be 
x = (3.0 x 5.0) - (3.0 + 5.0)
You can do it.