$7-3>0$
$x^{2}+20a^{2}x^{5}-40a^{3}x$
$x^3\left(7.5\right)x$
$-4562+3500$
$-5\cdot8+20$
$\frac{dy}{dx}=y^2\sqrt{x}$
$-25x=75$
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