$-\left(-8\right)+12+\left(-5\right)$
$8.735+5.9$
$4\tan^2x+12\tan x-27=0$
$5a-b=2c$
$6e^{2x-y}dx=dy$
$z^2-2z^2-7z^2+5z^2-3z^2$
$\left(3x-\frac{1}{9}\right)\left(3x+\frac{1}{9}\right)$
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