6. When 4 times the number x is added to 12, the result is 8. What number results when 2 times x is added to 7?

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad