$\lim_{x\to1}\left(\frac{x^9+4x^8+7x^6-12}{x-1}\right)$
$\int-5x^2\left(4x^3-7\right)^{-2}dx$
$\left(a+y\right)\left(a-y\right)$
$3x\ge9$
$0.12\cdot10^5$
$\left(3m^2+4n^3\right)^2$
$-\left(14+6\right)-5+13+\left(-7-5\right)$
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