Perimeter is the sum of all three sides. Isosceles has two sides the same and one side short.
82 = (3x+2) + (5x-14) + X
82 = 3x + 2 + 5x - 14 + X
82 = 9x -12
94 = 9X
10.44 = X thats the base
3(10.44)+2 is the one side = 33.3333
5(10.44)-14 is the other side = 38.222
10.44 + 33.33 + 38.22 add up to 82