First find how many pairs of slippers Nancy has: 6 pairs + 9 pairs = <<6+9=15>>15 pairs
Then add that number to the number of pairs of boots she has: 15 pairs + 6 pairs = <<15+6=21>>21 pairs
Then triple that number to find how many pairs of heels she has: 21 pairs * 3 = <<21*3=63>>63 pairs
Then add the number of pairs of each kind of shoe she has: 15 pairs + 6 pairs + 63 pairs = <<15+6+63=84>>84 pairs
Then multiply the number of pairs by 2 to find the number of individual shoes she has: 84 pairs * 2 shoes/pair = <<84*2=168>>168 shoes
#### 168