$\frac{x^2}{x^4+36}$
$\left(4ax-3by\right)^2$
$-3\cdot\left(5-2-7\right)+3^2-5\cdot3$
$m^2+11m-28$
$-15\:+\:-10\:+\:-1\:+\:-6\:=\:$
$x\frac{dy}{dx}+y=-4x$
$25x^6-144$
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