How do you evaluate $9 + 7z$ for z=3?

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Answer 1 · 2018-04-02T09:58:14

Substitute $color(red)(3)$ for $color(red)(z)$ and evaluate the expression giving:

$9 + 7color(red)(z)$ becomes:

$9 + (7 * color(red)(3)) => 9 + 21 => 30$

How do you evaluate 9 + 7z9 + 7z for z=3?