$\left(a^4b^{-1}\right)^{-2}\left(a^{-3}b\right)^2$
$-3000+1000$
$\frac{\left(x+3\right)+\left(x-1\right)}{\left(-x+1\right)}$
$647\cdot56$
$8x+8+9+7x$
$\sqrt[4]{a^2b^2}$
$\int\left(\frac{x-1}{x^3-9x^2}\right)dx$
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