$\frac{\left|4-x\right|}{x^2-11x+28}$
$x^4-\frac{1}{3}x^3-\frac{3}{2}x^2=0$
$y=4x^2-6x+2$
$3^{-8}\cdot3^{10}$
$12-\left(-7\right)-8$
$1\:x\:\:\:-8$
$\ln\left(x-1\right)\left(2x+9\right)$
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