Express the following as an algebraic expression:
(iii) The subtraction of $5 m$ from $3 n$ and then adding $9 p$ to it.

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Solution

Subtracting $5 m$ from 3n = $3 n - 5 m . . . . . . (1)$

Adding $9 p$ to $(1)$

$∴$ $(3 n - 5 m) + 9 p$

Hence, the required expression is $(3 n - 5 m) + 9 p$ .

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