$sm-bm+sn-bn$
$\left(4x^3-5y^4\right)^2$
$x^3+6x^2-2x-12$
$\log_{42}\left(\frac{x+4}{x^6}\right)$
$3x^2+8x+\frac{6}{7}\cdot\frac{6}{7}x^2-x+6$
$\left(3a^2+7\right)\left(2a+5\right)$
$\left(2\right)\left(3a+5b\right)^3$
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