$15x^3+20x^2-5x$
$2-\sec\left(x\right)^2$
$\frac{\left(a^4-b^4\right)}{a-b}$
$le^-2t-4$
$2^3-1$
$\frac{2}{x-1}+\frac{2x}{x+3}=\frac{6}{x}$
$3x^{2\:}-2x=5$
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