$\int\left(x+x^{-3}\right)dx$
$11\cdot9-8\cdot2$
$x^2+9x=-14$
$x\:+\:5\:=\:-8\:$
$a^2+3a-40$
$y=\frac{2xy}{1+x^2}$
$n\frac{1}{e^2}$
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