The lengths of the sides of a triangle are 3x, 5x – 12, and x + 20. find the value of x so that the triangle is isosceles.

The solution to the problem is as follows:

Any two side are equal in isoscles triangle 

5x-12=x+20 
4x=32

x=8 
5x-12=28
x+20=28 
5x=40 
28,28,40

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