$7x^2-343=0$
$72x^2-x-1$
$\left(3a^2-b\right)^3$
$\left(4^{-3}\right)^5\left(4\:x\:4^2\right)^4$
$\frac{dy}{dx}=\frac{12y^2}{x}$
$\lim_{x\to-\infty}\left(\frac{1}{3}x^5+2x^3-x^2+8\right)$
$5x^2-20x-5x^2+30x+2x+5x-10x^2$
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