$2x^3+6$
$4x^2+y^2=16$
$25x^2-40x$
$9x^4-21x+6$
$2\left(8x+3y\right)\:\left(8x-3y\right)$
$\left(2y-b\right)\left(2y+b\right)$
$75a^3+30a^2+3a$
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