Answer :
The perimeter of the triangle is 7x + 13.
Given
A triangle has 3 sides with lengths 8x +6, 5x-5, and -6x+12.
The perimeter of a triangle;
The perimeter of the triangle is defined as the sum of all threes sides of a triangle.
The perimeter of the triangle is given by;
[tex]\rm Perimeter \ of \ the \ triangle=Side \ A + Side \ B +Side \ C[/tex]
Substitute all the values in the formula;
[tex]\rm Perimeter \ of \ the \ triangle=Side \ A + Side \ B +Side \ C\\\\\rm Perimeter \ of \ the \ triangle=8x+6+5x-5-6x+12\\\\\rm Perimeter \ of \ the \ triangle=7x+13[/tex]
Hence, the perimeter of the triangle is 7x + 13.
To know more about Triangle click the link given below.
https://brainly.com/question/25813512