$-4\left[6-2\left(x-4\right)\right]+9x$
$\frac{x^2}{9}-1$
$\int8x\tan x^2dx$
$-\left(+2\:-\:3\:+\:5\right)\:+\:\left(-2\:+\:6\:-\:4\:+\:7\right)$
$6x^2+3x-9-\left(-2x^2+4x-1\right)$
$\frac{dy}{dx}2\sqrt{x}+\sqrt{y}=2$
$2\left(3x-4\right)\:-\left(x-4\right)\:=\:26$
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