6. (3 points) Starting with 100, perform the operations "add 15, subtract 12, add 3, add 15, subtract 12, add 3, ... " in a repeating sequence. After 26 steps (1 step refers to each "add" or "subtract" operation), the result is $\qquad$ .
【Solution】Solution: In each calculation cycle, the operation takes 3 steps, increasing: $15-12+3=6$, then $26 \div 3=8 \cdots 2$,

Therefore, $100+6 \times 8+15-12$
$$
\begin{array}{l}
=100+48+3 \\
=151
\end{array}
$$

Answer: The result obtained is 151.
The answer is: 151.