$x^2+4x+9\le0$
$3x^2-18x+12=0$
$7-6c+9c$
$xy+y^2y'=6x$
$4\sin x+5=7$
$\frac{a^2+2a\:-\:3}{a\:+\:1}$
$\left(2-5m\right)\cdot\left(2+5m\right)$
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