$6d+9d$
$\left(2x^2-9y\right)^3$
$6x^2-y^2=5$
$18-\left[2+\left[9-\left(6-4\right)-5\right]\right]$
$\ln\left(x-31\right)-\ln\left(4-3x\right)=5\ln\left(2\right)$
$x^2-2\le3x$
$\left(x+y\right)\left(x+y\right)+\left(x+y\right)$
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