$10^{x+y}=5x$
$\frac{1}{\left(x^2-1\right)}+\frac{1}{\left(x-1\right)}$
$\frac{3}{2}x^3+\frac{3}{8}x^2+\frac{3}{128}x$
$2\ln x-\ln y$
$55xy+81xy$
$4.7+x=2.1$
$\int\frac{1}{\sqrt{81-x^2}}\:dx$
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