$\left(\frac{2}{3}a^3-\frac{1}{2}a^2b\right)+\left(\frac{1}{2}a^3+\frac{3}{4}a^2b-5a^3b^2\right)$
$\frac{x+4}{x^2-x-42\:}+\frac{3}{7-x}$
$16^2+4^2\cdot2$
$12:-8$
$\int\frac{1}{1-y^2x^2}dx$
$dx-e^{-9x}dy=0$
$\int\frac{x+9}{x^2+5x}dx$
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