A-(100-63)=38

To solve the equation \( a - (100 - 63) = 38 \), we first simplify the expression within the parentheses:

1. Calculate \( 100 - 63 \): \[ 100 - 63 = 37 \]

2. Substitute this back into the equation: \[ a - 37 = 38 \]

3. Next, add 37 to both sides to isolate \( a \): \[ a = 38 + 37 \]

4. Perform the addition: \[ a = 75 \]

Therefore, the value of \( a \) is \( 75 \).