$9x^2+24x+72y+16=0$
$x^2-20x+400$
$-521+994$
$\frac{dy}{dx}=\frac{6xy}{t^2+1}$
$x^2+25+156.25$
$\left(x^3y^4\right)^2$
$7s\:+\:3y\:-4s\:+\:9y\:-\:y$
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