答案：(a) $x<\dfrac{19}{5}$ (b) $3$
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$\begin{array}{rcl} x+1 & < & \dfrac{x+25}{6} \\ 6(x+1) & < & x + 25 \\ 6x + 6 & < & x + 25 \\ 5x & < & 19 \\ x & < & \dfrac{19}{5} \end{array}$
- $3$
