✅ Can someone explain how this ternary expression works

total -= TotalMeetsMinimum() ? 5.00 : 0.00;

total -= TotalMeetsMinimum() ? 5.00 : 0.00;

Given that TotalMeetsMinimum returns a boolean.

I don't understand because of the

-=

-=

symbol, like here, it's like we are doing

total = total - TotalMeetsMinimum() ? 5.00 : 0.00;

total = total - TotalMeetsMinimum() ? 5.00 : 0.00;

?
If no, then how do we read that expression please