-3+5-7

To solve the expression -3 + 5 - 7, you need to follow the order of operations, which is often referred to as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).

In this expression, there are no parentheses or exponents, so we will move straight to addition and subtraction.

Step 1: Perform addition from left to right. -3 + 5 = 2

Now, the expression becomes 2 - 7.

Step 2: Perform subtraction from left to right. 2 - 7 = -5

Therefore, the solution to -3 + 5 - 7 is -5.