$-\frac{x^4-2x^3+6x^2-4}{x-3}$
$\log7+\log\left(x^2-4\right)=\log35$
$\int\frac{8x^2}{\left(4-x^3\right)^4}dx$
$\left(a-b\right)\left(2a+3b-6\right)+\left(4a+5b\right)$
$-3\cdot2\cdot\left(-10\right)$
$\frac{2-x}{x+3}>-2$
$6^3.\:3^2$
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