$6k^2-3k^2+8k-5k$
$x^2+7x-6=0$
$5^2+25-24$
$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(2x\right)\right)^{x-\frac{\pi}{2}}$
$\frac{3a^{7}}{a^{7}}$
$4p^2-9$
$-5x^2+15x=0$
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