$38\:x\:-42$
$7\cdot\left(x-2\right)>2x-4$
$\sqrt[4]{81x^8y^6}$
$\lim_{x\to0}\left(\frac{28}{x}-\frac{28}{e^x-1}\right)$
$20+90+51g$
$8x^6-10x^5+5x^3$
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