Agirl scout has (5x-12) boxes of cookies and sells (3x+18) of them. write an expression to represent the amount of boxes she has left. also can you show me the work that gets this answer not just the answer

He letter p on the number line below represents the number . (use the hyphen for negative numbers and write answer as a decimal, such as –7.2) number line from negative 7 to positive 7 in increments of 0.5 is shown. only the whole numbers are labeled. a point labeled p is placed at the eleventh tick mark to the left of 0.