What is the solution set to the inequality 7z+5> 47

Really need on these. i have no idea what to do

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

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