$\left(3m+5\right)\left(3mn-2\right)$
$10x^6-15x^5+20x^4+30x^2$
$m^4-9$
$2x^2+8xy+8y^2-x^2-4xy+4y^2+x^2-4y^2$
$7-10-5-4+6-1$
$\int-3xe^{9x}dx$
$4a-20b$
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