$z$ is multiplied by $(- 3)$ and the result is subtracted from $13$ ________________.

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Solution

The product when $z$ is multiplied by $(- 3)$ $= - 3 z$
According to the question, the required number $=$ $13 -$ Product obtained
$=$ $13 - (- 3 z)$
$=$ $13 + 3 z [(-) \times (-) = +]$
Thus the required number is $13 + 3 z$

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