I need math help..again

lol yeah im having a bad day with math..
I need help on two more questions..

1. Tom was playing a video game in which he gained 5/6 (fraction) of a point if he successfully hit a fraction target, but lost 3/4 of a point for each missed target....

What was Tom's score after a game in which he missed 10 targets and hit only 4? Write a clear mathematical expression to illustrate your anwer.

aand.

2. John Tyler and Deb are discussing the number of CDs they each own. Tyler owns five more than twice the number of CDs that John owns, while Deb owns two less than three times the number of CDs that John owns.

A) let and represent the number of CDs that John owns. Write expressions to represent the number of CDs owned by Tyler and Deb.

b) Write a SIMPLIFIED expression to represent the TOTAL number of CDs that the THREE friends own.

1) 5/6 (4) - 3/4 (10) = x
3.333 - 7.5 = x
x = -4.167

2) T = 5 + 2j
D = 3j - 2
X = j + (5+2j) + (3j - 2)

J = john
T = tyler
D = Deb
X = total number of CD's owned

hope that helps. I am good at math so just ask me if you ever need math help