$\frac{a}{b}+1$
$\left(52-\left[-30+40\right]-80\right)-\left(+30\right)$
$\int\frac{29\sqrt{x^2-36}}{x^4}dx$
$\frac{0}{4}+5$
$15a^2-6a^2-8a^2+20a^2-5a^2-12a^2$
$\left(-2x^{-2}\right)^2$
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