Answer
$\frac{63}{2}$ or 31.5
Work Step by Step
$(9 + 3(4-2)) \div \frac{10}{21}$
$=(9 + 6) \div \frac{10}{21}$
$=15 \div \frac{10}{21}$
$=\frac{15}{1} \times \frac{21}{10}$
$=\frac{315}{10}$
$=\frac{63}{2}$
$=31.5$
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