$x2\:+\:5x\:+\:6\:\le0\:$
$4x\ge12$
$40+\left[25-\left(3+2\right)\right]$
$\left(-8x^2y^3\right)\left(-8x^2y^3\right)$
$\frac{2x^2-15x-27}{x^2-16x+63}$
$172\cdot7$
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