$-5x^2+30x+40$
$a^6-3a^2+8a^3-4a^2$
$12-0,85$
$\frac{x^2}{16}-\frac{2}{4}x+\frac{1}{5}$
$3^{x^2-7x-\frac{11}{2}}=9\sqrt{3}$
$x^2-2x-4<0$
$a^2b^2+\:2abc+c^2$
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