## Intermediate Algebra (6th Edition)

$12x-3$
The perimeter of a triangle is equal to the sum of the length of each of its three sides. Length of side 1: x Length of side 2: 5x Length of side 3: 6x-3 Perimeter: $(x)+(5x)+(6x-3)=(x+5x+6x)-3=12x-3$