$\lim_{x\to0}\frac{x}{x^2-x}$
$3x^2+8x+15$
$\left(x+3y+z\right)^2$
$\log_c\left(x^8y^8z\right)$
$-a^3-25a^2+24a^3-12a+9$
$3x^2-6x+3$
$7y-8^2$
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