100-(1+19)

The calculation for \(100 - (1 + 19)\) is as follows:

1. First, calculate the expression inside the parentheses: \(1 + 19 = 20\).
2. Then, subtract that result from 100: \(100 - 20 = 80\).

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