$\frac{dx}{dy}+x=xy\:e^{y+2}$
$4y^2+20y+21$
$-2\left(6x+6-2\left(9x+10\right)\right)$
$\sqrt{x}+1=\sqrt{x+9}$
$16-n^4$
$-5\left(-7-3x\right)-7$
$\frac{x^2}{20}+10=15$
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