minus 5 upon 11 plus minus 6 upon 13 equal minus 6 upon 13 plus minus 5 upon 11 verify
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-5/11+(-6/13)=-6/13+(-5/11)
-5/11-6/13=-6/13-5/11
0=0 is ans
-5/11-6/13=-6/13-5/11
0=0 is ans
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