$8m^2n+5m^2n-10m^2n$
$25.67\cdot2.3+4.8$
$x^2+30x+200$
$x^3-12x^2+47x-60$
$\left(\frac{x-1}{x+1}\right).\left(\frac{x^2+2x+1}{2x-1}\right)$
$\frac{d}{dx},\:3x^2y^2=4x^2-4y^2$
$9z^2-42z+49$
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