Respuesta :

benmartin

Answer:

x=23

Step-by-step explanation:

All four sides add up to 136, so subtract 4 and 4. This leaves 128. Divide that by 2 for the remaining sides, and that is 64 per side. Set 3x-5 equal to 64.

3x-5=64

+5      +5

3x=69

/3     /3

x=23.