$a\left(4\right)+2a+9$
$x^2-8x-15=-x^2$
$\left(5z^3-2y^4\right)^2$
$\left(3x+\sqrt{6}\right)^2$
$80x^2+200x+125$
$\frac{x-5}{x+6}=0$
$\frac{dy}{dx}=\frac{y^2+2y+2}{x^2-6x+9}$
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