$3x^2-2x\ge2x^2+15$
$18y^{2}+15y-18$
$3000+500+\left(-250\right)+400$
$6x+2\left(x-3\right)-3$
$xy\left(3x^2+2x-7\right)$
$9x^2+48x-64$
$91-\left(-69\right)$
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