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Subtraction of integers:
When dealing with negative integers, the sign cannot be ignored.
-Negative sign, means we move to the left side of the given number, given number of steps.

For example when working out +2 - 4, we start from +2 and move 4 steps to the left. Thus +2-4 = -2.
Example 1. Use number line to work out. +3-7. Example 2. Use number line to work out. -4-3.