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Verify the property: x\ "x"\ y=y\ "x"\ x...

Verify the property: `x\ "x"\ y=y\ "x"\ x\`` by taking:
(i)`x=2, y=7/(-8)`
(ii) `x=0, y=(-15)/8`

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(i)`x=2, y=7/(-8)`
`=>2 xx (-7)/8=(-7)/8 xx 2`
`=>(-7)/4=(-7)/4`

(ii) `x=0, y=(-15)/8`
`=>0 xx (-15)/8=(-15)/8 xx 0`
`=>0=0`
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