20-20*1345-45

Let's evaluate the expression step by step:

Expression: 20 - 20 * 1345 - 45

According to the order of operations (PEMDAS/BODMAS), multiplication is performed before addition and subtraction.

1. Calculate 20 * 1345: 20 * 1345 = 26,900

2. Substitute back into the expression: 20 - 26,900 - 45

3. Perform subtraction from left to right: 20 - 26,900 = -26,880 -26,880 - 45 = -26,925

Final answer: -26,925