$\left(-9\right)\:-\:\left(-7\right)\:$
$\sec^2x-2=0$
$-x^2+10x-16=0$
$x+\frac{4}{x}=6$
$\int\frac{\left(x+5\right)}{\left(x^2\left(x^2+4\right)\right)}dx$
$\left(a^2b^2+81\:c^2\right)\left(a^2b^2-81\:c^2\right)$
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