Divide −21abc2 by 7abc.
$\frac{-21 a b c^{2}}{7 a b c}$
$=\frac{-21 \times a \times b \times c \times c}{7 \times a \times b \times c}$
$=-3 a^{(1-1)} b^{(1-1)} c^{(2-1)}$
$=-3 c$
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