The perimeter of a triangle is 36. Find the value of x. Show your work. 2x+1 3x-4

Not a very clear exposition. If two sides are

2x+1 and 3x-4

you have not provided enough information. Something else about the shape must be given, such as

right triangle,
isosceles

or something else to allow calculation of the 3rd side.

Now, with that in mind, show your</u work.