$9+\left(+11\right)-\left(-8\right)-5$
$\left(5x+2y\right)^2+6z\left(5x+2y\right)+9z^2$
$x^2-25x-54$
$2x\ge6$
$\left(2n+m\right)^3$
$y2\:-\:9y\:+\:20$
$xe^{2x^2+3y^2}dx-ye^{-x^2-2y^2}dy=0$
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