$9+8\cdot\left(3-5\right)+9$
$\frac{d}{dx}8^{x-3}$
$2+7-6+8$
$x^2-3x+7$
$\int x\:2^{-x}\:dx$
$b^2+2bd+d^2$
$7x^2-30x+2=0$
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