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verify that -(-x)=x for x=11/15 and x=-13/17 |
| Case 1 -(-11/5) = 11/15 -(-) = + So, 11/15 = 11/15 Therefore case 1 is proved Case 2 -(-(-13/17) = -13/17 -(+) = - -13/17 = -13/17 Therefore case 2 is proved |
