$2-\left|4\right|-\left|6\right|$
$4k^2+16k+25$
$\left(\frac{1}{x}-\frac{1}{\left(e^x-1\right)}\right)$
$\left(2x^2-8y^3\right)$
$\left(4m^5+by^6\right)^2$
$x^2+36x=88$
$\:\left(-2x^2+6xy+y^2\right)+\left(3x^2-8xy-3xz\right)$
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