-3
look at this number line
-4 Â Â Â -3 Â Â Â -2 Â Â Â -1 Â Â Â 0 Â Â 1 Â Â 2 Â Â 3 Â Â 4
The numbers on the left side of the 0 are negative since they have a value below zero. This can be represented as a  - (negative) sign
Step-by-step explanation:
Keep in mine this number line can continue forever meaning every possible number on the left side of the 0 is negative.