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Verify each of the following: (i)(3)/(...

Verify each of the following:
(i)`(3)/(7)xx(-5)/(7) = (-5)/(9)xx(3)/(7)`
(ii) `(8)/(7) xx (13)/(9) = (13)/(9) xx (-8)/(7)`
(iii) `(-12)/(5)xx (7)/(-36) = (7)/(-36) xx (-12)/(5)`
(iv) `-8 xx (-13)/(12) = (-13)/(12)xx(-8)`

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