$\frac{r}{7}\ge-6$
$\left(-2i+1\right)^3$
$3x^2+x-4$
$-97\cdot3$
$\int\frac{3x}{e^{3x}}dx$
$x^2+\:10x\:+\:6\:=\:0$
$8x^5-12x^3+4x^2$
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