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Shireen Alyssa
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I tried my best.. Hahahaha XD

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Shireen Alyssa
Created by Shireen Alyssa almost 8 years ago
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+ and - for 
Negative Numbers
Examples-
Evaluate 
-4 - 5 + 4 + 5 
 -4  - 5 + 4  + 5 
4 - -4 
= 0 
5 - -5 
= 0 
= 0 
Evaluate 
-8 - 7 + 3 + 18 
 -8     -7     +3  +18
-8 - -7
= -15
3 + 18 
= 21 
= 6
-15 - 21 = ?