$\left(4+r^2\right)^2$
$\frac{7\left(2-z\right)}{6}=-z$
$10x-9<3x+5$
$-\left(-12\right)+\left(-4\right)-11+8-\left(-3\right)-10$
$y''+y'+2y=0$
$a+d+f=0$
$\frac{dy}{dx}=\frac{y^2-2xy-x^2}{y^2+2xy-x^2}$
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