$7-6c+9c+9$
$6x^2+11x+4=0$
$2\cdot\left(-3\right)-5+7-\left(-2\right)\cdot\left(-3\right)$
$x^2\:+15x+28$
$-32x^2=-32x^2$
$\left(x+3\right)^2+\left(x-3\right)^2-6\:>0$
$-8-\left(+4\right)-\left(-5\right)$
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