$\frac{4a^4b^6c^2}{8ab^3c^7}.\:\frac{2a^2b^{-3}c^{-2}}{ab}$
$39\le5y-11$
$4x^2-14x+49$
$\left(\frac{3}{2}m+\frac{1}{2}\right)^3$
$\left(4x-12\right)\left(4x-9\right)$
$x^2-2x-14=0$
$3x^2-9x-84=0$
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