Answer
$0.5$ inches
Work Step by Step
$1+1+3x+2(\frac{1}{8x})=8.5\\
2+3x+\frac{2}{8x}=8.5\\
2+\frac{13}{4x}=8.5\\
\frac{13}{4x}=6.5\\
4x=\frac{13}{6.5}\\4x=2\\x=0.5$
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