$\frac{5dy}{dx}+7x=0$
$\frac{1}{2}xy^2+\frac{2}{3}xy^2-\frac{2}{3}x^2y+\frac{3}{5}xy^2$
$\left(\sqrt{2}e^x\right)^2$
$\:3x^2+54x+168$
$-21.\:-5$
$24r+30$
$5a-a+8a-12a+4a$
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