I think it's D because you times everything from the left column to the right column
Answer: 11.2 because I know trust me. I did a worksheet with this same question and got 11.2 and it was correct.
4x+3=3(x+3)
4x+3=3x+9
4x-3x=9-3
x=6
So The Father is 24 and the Son is 6