$\left(x^3-9\right)+\left(45-5x^2\right)$
$3\left(5x-4\right)^2$
$3x^2-10x+7$
$y+y^2=x^2y$
$7c=a\left(b-c+1\right)$
$\frac{d}{dx}\left(ln\left(x^2+6^x\right)\right)$
$\frac{\left(0.8-0.3\right)}{x}$
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