$$21 a ^ { 6 } b ^ { 7 } - 15 a ^ { 2 } b ^ { 8 } + 33 a b ^ { 2 } + 18 a ^ { 7 } b$$
$3ab\left(6a^{6}+7a^{5}b^{6}-5ab^{7}+11b\right)$
$$3\left(7a^{6}b^{7}-5a^{2}b^{8}+11ab^{2}+6a^{7}b\right)$$
$$ab\left(7a^{5}b^{6}-5ab^{7}+11b+6a^{6}\right)$$
$$3ab\left(7a^{5}b^{6}-5ab^{7}+11b+6a^{6}\right)$$
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