Question

The sum of two times a number and 5 more than the number is the same as the difference between -15 and twice the number. What is the number?

Answer 1

(2x)(x+5) = 2x-15

4x^2 + 5x = 2x-15

4x^2 = 7x -15

16x = 7x - 15

16x + 15 = 7x

2 2/7 + 2 1/7 = x

x = 4 3/7