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Verify by substitution that the root of ...

Verify by substitution that the root of .
(i) `3x-5=7` is `x=4` .
(ii) `3+2x=9` is `x=3` .
(iii) `5x-8=2x-2` is `x=2` .
(iv) `8-7y=1` is `y=1`.
(v) `(z)/(7)=8` is `z=56` .

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