$(7 a b c + b^{2}) (7 - b c) + c ({2 b}^{3} - 9 a b)$

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Solution

$(7 a b c + b^{2}) (7 - b c) + c (2 b^{3} - 9 a b)$
$\Rightarrow 49 a b c - 7 a b^{2} c^{2} + 7 b^{2} - b^{3} c + 2 b^{3} + c - 9 a b c$
$\Rightarrow 40 a b c - 7 a b^{2} c^{2} + 7 b^{2} + b^{3} c$ .

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