Solve the equation: $3 (n - 5) = 21$

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Solution

Find the value of $n$ :
$3 (n - 5) = 21$
$\Rightarrow (n - 5) = \frac{21}{3} [D i v i d i n g e a c h s i d e b y 3]$
$\Rightarrow (n - 5) = 7$
$\Rightarrow n = 7 + 5 [a d d i n g 5 o n e a c h s i d e]$
$\Rightarrow n = 12$
Therefore, $n = 12$

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