$\left(-8\right)\cdot\left(-9\right)-\left(+5\right)\cdot\left(-4\right)-\left(+7\right)$
$4x^2+2x+2$
$\frac{d}{dx}6\sqrt{x}+3\sqrt{y}=5$
$5\::\:-5$
$25x^2-20x+144$
$23-8x=15$
$9x^2\:+\:42^2x\:+49^3$
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