$x^2+7x=0$
$\int-\frac{2}{3}x^2\cos\left(x\right)dx$
$25x^2y^2-16$
$-3t\left(-2t+1\right)^2$
$\frac{x^3}{4-x}$
$19m-7n+8m+7n$
$\lim_{x\to\infty}\left(\frac{1}{n}\right)^2$
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