$adb+bda+ab\left(3da+db\right)=0$
$\left(16-7\right)\cdot\left(8+2\right)$
$-x\sqrt{75x}$
$z^2+z-7=0$
$y'=\frac{x-y}{\:2x}$
$x+\frac{8}{x^6}$
$2\cos^2x=7\cos-3$
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