$\frac{x}{3}-21=12$
$f\left(x\right)=25-20x+4x^2$
$\left(x^3+x^2+1\right)\left(x-1\right)\left(x+5\right)$
$\lim_{x\to0}\left(\frac{e^{6x}-1}{x^2}\right)$
$15c^2-12cd$
$\left(2+-x\right)^4$
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