$\log_d\left(x^c\right)-\log_d\left(y^b\right)$
$\left(100-b^2\right)$
$25x^2+200x+400$
$\lim_{x\to-1}\left(3x+\frac{1}{x}\right)$
$\frac{x}{y}-\frac{x}{1-y}$
$\left(2x^2-25\right)\left(2x^2+25\right)$
$-6359-4872-45$
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