Find the difference of the following :
`{:(a.,23 - (7),b.,54 - (32),c.,83 - (-71)),(d.,43 - (-89),e.,39 - (-72),f.,(-89) - (-12)),(g.,(-81) - (50),h.,(-32) - (-13),,):}`

Answer

Let's solve the problems step by step:

### Step 1: Solve for (a) 23 - 7
To find the difference:
\[ 23 - 7 = 16 \]

### Step 2: Solve for (b) 54 - 32
To find the difference:
\[ 54 - 32 = 22 \]

### Step 3: Solve for (c) 83 - (-71)
Here, we need to remember that subtracting a negative number is the same as adding the positive:
\[ 83 - (-71) = 83 + 71 = 154 \]

### Step 4: Solve for (d) 43 - (-89)
Again, subtracting a negative number means adding:
\[ 43 - (-89) = 43 + 89 = 132 \]

### Step 5: Solve for (e) 39 - (-72)
Using the same rule:
\[ 39 - (-72) = 39 + 72 = 111 \]

### Step 6: Solve for (f) -89 - (-12)
Subtracting a negative number:
\[ -89 - (-12) = -89 + 12 = -77 \]

### Step 7: Solve for (g) -81 - 50
This is a straightforward subtraction:
\[ -81 - 50 = -131 \]

### Step 8: Solve for (h) -32 - (-13)
Subtracting a negative number:
\[ -32 - (-13) = -32 + 13 = -19 \]

### Summary of Results:
- (a) 23 - 7 = 16
- (b) 54 - 32 = 22
- (c) 83 - (-71) = 154
- (d) 43 - (-89) = 132
- (e) 39 - (-72) = 111
- (f) -89 - (-12) = -77
- (g) -81 - 50 = -131
- (h) -32 - (-13) = -19