$\left(15a^{x+1}\:-\:6\right)\:\left(15a^{x+1}\:-\:17\right)$
$\ln e^{4k}$
$-20+-1$
$25x^2-20xy+4y^2$
$-\left(x+9\right)\left(x+7\right)$
$81a^{10}b^{8}-100c^{4}$
$62\cdot9$
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