292 B
		
	
	
	
	
	
	
	
			
		
		
	
	
			292 B
		
	
	
	
	
	
	
	
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Let a represent any member of \mathbb{Z}. Then there is a unique member of \mathbb{Z} -a such that:
 a + (-a) = 0 
The sum of a number and it's negative (called the additive inverse) is always zero.