Question
Fill in the missing fraction: $\square-\frac3{21}\;=\;\frac5{21}$
✓
Answer
$x-\frac3{21}\;=\;\frac5{21}$
$x=\frac5{21}+\;\frac3{21}=\;\frac{5+3}{21}=\frac8{21}$
Thus, $\frac8{21}-\frac3{21}\;=\;\frac5{21}$
$x=\frac5{21}+\;\frac3{21}=\;\frac{5+3}{21}=\frac8{21}$
Thus, $\frac8{21}-\frac3{21}\;=\;\frac5{21}$
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