If 13 is added to a number and the sum is doubled, the result is -5 less than the number. Find the number.

Answer 1

Let x be the number

From the description:

2(x+13) = x - 5

2x +26 = x-5

2x -x = -5 - 26

x = -31

The description is confusing since it says -5 less than the number which would be a different equation:

2(x+13) = x - (-5) = x+5