Find the value of :
`39-35+7-(-4)+21`

Answer

To find the value of the expression \( 39 - 35 + 7 - (-4) + 21 \), we will solve it step by step.

### Step 1: Simplify the expression
The expression is:
\[ 39 - 35 + 7 - (-4) + 21 \]

### Step 2: Handle the subtraction of a negative number
Recall that subtracting a negative number is the same as adding its positive counterpart. Thus, we can rewrite the expression:
\[ 39 - 35 + 7 + 4 + 21 \]

### Step 3: Perform the subtraction
Now, we can perform the subtraction:
\[ 39 - 35 = 4 \]

### Step 4: Substitute back into the expression
Now we substitute back into the expression:
\[ 4 + 7 + 4 + 21 \]

### Step 5: Add the numbers together
Now, we will add the numbers step by step:
1. First, add \( 4 + 7 \):
\[ 4 + 7 = 11 \]
2. Next, add \( 11 + 4 \):
\[ 11 + 4 = 15 \]
3. Finally, add \( 15 + 21 \):
\[ 15 + 21 = 36 \]

### Final Answer
Thus, the value of the expression \( 39 - 35 + 7 - (-4) + 21 \) is:
\[ \boxed{36} \]