$\frac{1}{4}ln\left(\frac{x-2}{2}+1\right)-ln\left(\frac{x-2}{2}-1\right)$
$81^{2x+4}\cdot\:9^{3x-5}=243^{-14}$
$\left(-2x^3yz\right)\left(3x^2y^2z^4\right)\left(-5x^3y^4z\right)$
$8^2+2\cdot8\cdot1+1^2$
$\frac{125-345x^{15}}{5-7x^5}$
$\left(x+2y\right)dx=xdy$
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