Cho \(\mathop {\lim }\limits_{x \to 1} \frac{{f\left( x \right) - 4}} = 2\). Tính: \(\mathop {\lim }\limits_{x \to 1} 3f\left( x \right)\).

Cho \(\mathop {\lim }\limits_{x \to 1} \frac{{f\left( x \right) - 4}} = 2\). Tính:

\(\mathop {\lim }\limits_{x \to 1} 3f\left( x \right)\).