$\left(-5\:+7\:times\:1\right)\:-9\:times\:5$
$\ln\left(x\right)=\ln\left(x+6\right)-\ln\left(x-4\right)$
$2x^4-x-1$
$x^2\ln x-12x\ln x=0$
$x^4-18x^2+8$
$x-6=2x+2$
$\frac{sec\left(\theta\right)}{cos\left(-\theta\right)}$
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