Could anyone help me solve for x? I've tried multiple times and can't seem to get the answer that was given

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

15/16 as a decimal rounded to the nearest hundredth