$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 8 x + 16 }$
$3b^2\left(3n+4m\right)-6cn+8cm$
$-52\:x-3$
$x\frac{dy}{dx}+3x^3\cdot y=3x^3\cdot e^{-x^3}$
$x^2y-3xy'+4y=0$
$x^2+6x+9-8y+xy\left(x-z^5\right)$
$1\cdot\left(-27\right)$
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