$15r+10$
$15a+6b$
$-\frac{1}{3}\sqrt{-1800}$
$\left(r-3\right)^2$
$\frac{d}{dx}y^2-2xy+b^2=0$
$2\left(x^4-9x^2+4x\right)$
$csc^2x-4=0$
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