$7x^2+28x-840$
$2k^2-17k+6=0$
$\left(\frac{a^2}{a^2}\right)\left(\frac{a^{-2}}{a^{-5}}\right)$
$\left(3\right)\left(25x^2\right)\left(1\right)$
$\lim_{x\to-4}\sqrt[3]{2x-19}$
$3x+2y-10x+5z-10z+9y$
$2x^3-2x^2-2x-2$
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