2x+15=x/2-3

Can someone solve for x and show the answer step by step?

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers