$2\:+\:\left(-4\:+\:5\right)\:-\:\left(\:6\:+\:6\right)\:+\:7\:=\:$
$\frac{d^2}{dx^2}\left(y^2-xy+x^2\right)$
$3x+4x+5$
$4x^2-6x$
$8.-7.90$
$125^3$
$19m-10m-6m$
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