$4x^2+28x+49\le0$
$\sqrt{2.1361}$
$2-\left[\left(-8\right)+3\right]+3-\left(-5\right)$
$\sqrt{25a^4b^6c^{10}}$
$3y^5\cdot2$
$27-\:36\:+\:90\:-\left(-45\right)$
$\frac{8}{8}\quad$
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