$20x^2\frac{dy}{dx}=4x^3x$
$-5x-4x+7+2x-8$
$81-9x^2$
$-72=24y$
$\int\:17\:dx$
$7x\left(3x-2\right)-8\left(3x-2\right)$
$7 x ^ { 4 } y + 5 x ^ { 2 } y + 10 x$
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