Solution:
Given data in the question-
Price of per piece of napkin at an outlet store - $4.25
Discount coupon used a $20 off coupon.

In the equation , x represents the number of napkins, and y represents the cost before tax.
She paid $43.75 before tax, which means 

Starla bought 15 napkins
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3x + 12 - 5x = 22
-2x + 12 = 22
-2x = 10
x = -5
Write the equation out, x is going to be your unknown number.
Combine like terms.
We have to isolate x, so get rid of the 12 by subtracting it from both sides of the equation.
Divide by -2.
Answer:
49/21
Step-by-step explanation:
You just have to switch the numerator and denominator so you can cancel out the number from one side of the equation in a normal problem