$\left(-4\right)^5\cdot\left(-4\right)^7$
$x^3-121x$
$16x^4-56x^2+49$
$4+3\left(-5\right)-6\left(-4\right)+3$
$e^{\frac{-6}{6}}$
$x^2-3x+6=2$
$x^2+11x+18<0$
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