The sum of 15 and 7 times a number is 22

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Me. i can't figure out this question. give an explanation too. .