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Simplify:
(i) ( *
) + (
*
) – (
*
)
(ii)
(iii)
(iv)
(i) +
-
=
=
=
=
(ii) +
+
=
=
=
=
(iii) +
+
= +
+
=
=
(iv) -
+
= - 1 +
=
=