Solve the equation below for x in terms of a

5(ax+4)-3ax=5a+2

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =