Rachel has 79 books in her collection. The average size of each book is shown below. She wants to buy shelves for her book collection. Each shelf is 34.5 inches wide and costs $12.95. How much will it cost Rachel to shelve her book collection? Explain how you found your answer.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

the answer is 21%.