$\left(12x-7\right)\cdot\:\left(144x^2+84x+49\right)$
$\sqrt{-48}$
$16x^2+64x+49$
$6-\left(2-9\right)-2\left[5-8-\left(-9-2\right)\right]$
$\frac{3x^4+5x^3+2x+3}{x^2-3x+2}$
$52-301-\left(-8\right)+400$
$\frac{x+9}{x-4}+\frac{2x-1}{x-4}$
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