$\frac{12x^2y^2z}{18xyz}$
$16x^2-72x+81$
$\ln y=\ln x+1$
$\frac{dx}{dt}+t^2x^3=0$
$\lim_{x\to\infty}\left(-\frac{2\cdot ln\left(2^x-1\right)}{x+1}\right)$
$-7-83+42+31-9-3$
$4328-879$
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