$\frac{2k^3k^3}{k^{-3}}$
$25a+25a$
$5x^{2-17x+3=-4x-5}$
$w^2-9w+20$
$7x+5<-2\left(4x-3\right)$
$\left[-8x\left(-4\right)\right]+16$
$\lim_{x\to0}\left(\frac{1}{log\left(1+x\right)}-\frac{1}{x}\right)$
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