If 5 is added to a number and the sum is doubled, the result is 7 less than the number. What is the number?

x = -17

Step-by-step explanation:

let the number be x

Lets break the statement up into steps:

"5 is added to a number" ---> x + 5

"and the sum is doubled" ---> 2 (x + 5)  this is "the result as stated in the question"

"7 less than the number" > x - 7

hence,

"the result is 7 less than the number" > 2 (x + 5) = x - 7

we simply solve for x

2 (x + 5) = x - 7

2x + 10 = x - 7    (subtract x from both sides)

2x + 10 - x = -7

x + 10 = -7    (subtract 10 from both sides)

x = -7 - 10

x = -17

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72