100-(93-74)-50+6.5=

Let's solve this step-by-step:

1. First, calculate the expression inside the parentheses:

   \[ 93 - 74 = 19 \]

2. Next, substitute this value back into the equation:

   \[ 100 - 19 - 50 + 6.5 \]

3. Now, perform the subtractions from left to right:

   \[ 100 - 19 = 81 \]

   \[ 81 - 50 = 31 \]

4. Finally, add 6.5:

   \[ 31 + 6.5 = 37.5 \]

Ответ: 37.5