Aflat costs 36% more today than when it was built .if the original cost of the flat was $90000, find it's price today < pls solve this

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?

What's the answer to this question 5x-15=-65