Question

Write an expression to show the total cost of an item x with a 35% discount.

Answer 1

the expression you're looking for is
x-.35x

Answer 2

\frac{x = 35}{number = 100} 

So basically x is what you're solving for,
35 is the percentage, or in this case the discount,
"number" is more or less your initial amount,
100 just represent that its a percentage