$3x^2-9x+4=0$
$r^2+8r+13=0$
$7^4-5^4$
$2ydx+e^{-3}dy=0$
$\frac{6x^3+5x^2-5x+9}{3x+1}$
$\frac{-10+\sqrt{3}}{2}=-5+\cos\left(x+135\right)$
$49z^2-126z+81$
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