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Verify the following: (i)(-12)/(5)+(2)...

Verify the following:
(i)`(-12)/(5)+(2)/(7)=(2)/(7)+(-12)/(5)`
(ii) `(-5)/(8)+(-9)/(13)= (-9)/(13)+(-5)/(8)`
(iii) `3+(-7)/(12)=(-7)/(12)+3`
(iv) `(2)/(-7)+(12)/(-35)=(12)/(-35)+(2)/(-7)`

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