\[\left| 6\frac{1}{4} - x \right| + \left| - \frac{3}{4} \right|;\ \ \ x = 2:\]
\[\left| 6\frac{1}{4} - 2 \right| + \frac{3}{4} = 4\frac{1}{4} + \frac{3}{4} = 7\frac{4}{4} = 8.\]