$\left(2x^2y-3xy^2\right)\left(2x^2y+3xy^2\right)$
$7a-\left(2a+5\right)$
$12x^5+14x^4-10x^3$
$2x\left(2\right)-5x-12$
$-4x+8>4$
$x^2-4x-1$
$1+-3+14$
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