$\ln\left(x^2+2x\right)+e^{-x}$
$-16z=-128$
$log\left(\frac{a^2}{b^4\sqrt{c}}\right)$
$\left(2x^4+7x^3-5x+17\right):\left(x+3\right)$
$x^4+7x^2+15x$
$\frac{5x^2-6x+4}{x+1}$
$2e^0$
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