100-(1+19)

The expression \( 100 - (1 + 19) \) can be simplified as follows:

1. Calculate the value inside the parentheses: \( 1 + 19 = 20 \)
2. Now substitute back into the expression: \( 100 - 20 \)
3. Finally, subtract: \( 100 - 20 = 80 \)

So, \( 100 - (1 + 19) = 80 \).