SOSSSSS sum of a #

Question

If the sum of a number and three is doubled , the result is seven less than the number. What is the number?

Answer 1

2(x+3)=x-7

2x+6=x-7

x=-13

Answer 2

Let the number be n, then according to the question:

 

2*(n+3) = n - 7

 

2n + 6 = n - 7

 

n = -13