`(a) x+y = y+x`
`(b) x-y = y-x`
`(c) x-y+y = y-x+x`
`(d) (x)xx(y+z) = (y+z)xxx`
`(e) (x-y)-z = x-(y-z)`
`(f) (x)xx(y-z) = (x)xxy-(x)xxz`

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