$\left(3x+6\right)x\left(3x-6\right)$
$24d-32d^2+4d^2$
$6\sec x+6=0$
$2m^5-7m^4+12m^3+8m^2=0$
$5^2+\left(-18\right)+\left(-4+3\right)^2$
$2x-7\ge5$
$8\left(-2\right)\left(-3\right)+5\left(4\right)\left(-2\right)$
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