At a restaurant you order a lunch that costs $6.50 and a beverage that costs $1.50.You leave a 15 %tip and the sales tax is 7%.What is the cost of the meal

y/x=18

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!