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Adding the opposite of a number to the same number will equal to 0 (zero).
Inverse property of addition: For every integer (a) there exists another opposite integer (-a) such that:
 
a + (-a) = 0.
Example:
12+(-12)=0.
  
Additive inverse of a is -a.
 
Important!
  • Addition and subtraction are inverse operations of each other.
  • Integers doesn't have multiplicative inverses.