$\frac{3}{4}x\frac{-2}{9}-1\frac{1}{2}+\frac{7}{8}:\frac{7}{3}$
$12+\left(-20\right)\cdot\left(-40\right):4$
$22^2\:-5^3+3^3\:+-1^5$
$\left(a^6b^4c^2-1\right)$
$\left(a^{-3}b^2\right)^{-2}\left(a^{-2}b^4\right)^4$
$\left(x^2+x\right)+\left(x-3\right)$
$\int\frac{1}{x-1}dx$
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