题目内容：

a number is added to 9 less than twice that number,if the result is 180,what is the number?

优质解答

Let the number be x.Twice the number = 2xNine less than twice the number = Nine less than (2x) = 2x - 9A number is added to 9 less than twice the number = A number is added to (2x - 9) = x + (2x - 9)R...