$2x+4\ge6$
$4x\:-\:3\:+5x\:-12x\:+8$
$7^{-2}\cdot7^3$
$r\left(x\right).s\left(x\right)$
$6+1-10-9+8$
$\left(1y+2\right)\left(13y-3\right)$
$4-\left(-15\right)-5-4-1-9+2-\left(-2\right)-9+\left(-1\right)-8-3-7$
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