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Evaluate each of the following algebra...

Evaluate each of the following algebraic expressions for `x=1,\ y=-1, z=2,\ a=-2,\ b=1,\ c=-2:`
(i) `a x+b y+c z`
(ii) `a x^2+b y^2-c z^2`
(iii) `a x y+b y z+c x y`

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