3. (6 points) Define new operations: $a \triangle b=(a+b)+2, a \bigcirc b=a \times 3+b$, when $(X \triangle 24) \bigcirc 18=60$, $X$ $=$ . $\qquad$
【Solution】Solve: $(X \triangle 24) \bigcirc 18=60$,
$$
\begin{aligned}
(X+24+2) \bigcirc 18 & =60, \\
(X+26) \times 3+18 & =60, \\
X+26 & =14, \\
X & =-12 ;
\end{aligned}
$$

Therefore, the answer is: -12.