Answer
$12x-3$
Work Step by Step
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:
$(x)+(5x)+(6x−3)=(x+5x+6x)−3=12x−3$
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