$x^2+4x-6=0$
$2+8-2+3+3$
$\frac{x^3-9^3}{x-9}$
$\left(10y^2\right)^2$
$x-y=5$
$\frac{18c^3}{-3c^2}$
$x^2-2x+15=0$
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