$$\left. \begin{array} { l } { - 49 a b ^ { 2 } c ^ { 3 } b y - 7 a b ^ { 2 } c ^ { 3 } } \\ { 36 } \end{array} \right.$$
$252ab^{2}\left(7by+1\right)c^{3}$
$$36=2^{2}\times 3^{2}$$
$$252ab^{2}\left(7by+1\right)c^{3}$$
$$1764ayb^{3}c^{3}+252ab^{2}c^{3}$$
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$-7ab^{2}\left(7by+1\right)c^{3},\ 36$
