$\frac{dy}{dx}-\frac{y}{x}=y$
$4+4x\sqrt{1}+4x^{2}$
$\left(8\right)\:\left(5\right)\left(2\right)\left(-9\right)\left(-5\right)$
$\log x-\log2=1$
$\left(-2ab^{-3}+4a\right)\left(-5ab^{-3}-2b\right)$
$\frac{2x^2-6x+5}{x+2}$
$3\left(-2\right)\left(2-6\right)+7$
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