\[0,25 - 31 - 5 = \frac{1}{4}t - 18\]
\[0,25t - 36 = 0,25t - 18\]
\[0,25t - 0,25t = - 18 + 36\]
\[0 = 18\]
\[нет\ такого\ \text{t.}\]