Let the shorter side be = x
Then the longer side = 2x - 3
So we have
2[x + (2x - 3)] = 66 divide both sides by 2
x + 2x - 3 = 33 simplify
3x - 3 = 33 add 3 to both sides
3x = 36 divide both sides by 3
x = 12 cm = the shorter side
And 2x - 3 = 2(12) - 3 = 21 cm = the longer side