$5x^2-8x-4$
$22-8x-15x^2+\frac{6x^3}{2x-7}$
$\left(2xy+5\right)\left(2xy-5\right)$
$\left(sa+3b\right)\left(3a+5b\right)$
$-x^3+4x^2-3x$
$\frac{3x^2-3x+9}{x^2-6x-7}<3$
$\left(e-3f\right)^7$
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