The perimeter of a rectangle is 26 meters

The short sides are (2x-6)
The long sides are (x+3)
What is the value of x?

x+3 + 2x-6 = 13

3x = 16
x = 16/3

short: 14/3
long: 25/3
p = 2(14/3 + 25/3) = 2(13) = 26