$-x^2+8x-15\le0$
$m-3=-21$
$7x^2y+4xy^2+9+8xy^2-5x^2y-2$
$-4y-2y^2$
$\frac{d}{dx}5\left(x^2+1\right)^{\sqrt{x}}$
$-9.98x\:-\:1.08x$
$4\left(2x-3\right)^2-9\left(3x+1\right)^2$
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