$5x\left(\frac{3}{4}\right)$
$\lim_{x\to0.00001}\frac{sin3x}{tan2x}$
$\left(-13n+20\right)^2$
$2x-4y+5z=0$
$\:x^3-3x^2-3x+9$
$\int_0^1\left(8x+x-x\right)dx$
$34-6x^2-15x-\frac{15}{x}-20$
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