$3n\:+\:5\left(-10n\:-\:3\right)$
$-6x^2+2x+1$
$x^2+y^2+3z^2=8$
$-4=\left|4\right|$
$\left(9-x^2\right)\left(x^2+9\right)$
$x^2+8x+12<0$
$x^2=77$
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