-3+5-7

The given expression is -3 + 5 - 7.

To solve this expression, you can start by adding or subtracting from left to right.

Starting with -3, adding 5 gives you 2 (-3 + 5 = 2).

Then, subtracting 7 from 2 gives you -5 (2 - 7 = -5).

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