$a^2-2a-80=0$
$x^2+20x+20$
$\int e^{2f}df$
$\int_{-\infty}^0\left(\frac{2}{4+x^2}\right)dx$
$k^2+11k^2+30$
$\left(4x-c^5\right)^3$
$-3+\frac{5.7}{6}$
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