$-9x^2y^2-12x^2y^2+5x^2+15x^2-8+9$
$4x^2+6x+2=0$
$-7\left(3m\:+\:7n\right)$
$3x\left(2-3x\right)$
$9x-4<5x+16$
$\left(17r+3m\right)^2$
$35^2$
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