$9+23-\left(-3\right)$
$\left(m-2n\right)\left(m^2+2mn+4n^2\right)$
$5x-6y+4-8x-12+x$
$84\cdot126$
$6y^3+4x^2-5=3y^3-3x^2+x+10$
$9x-4<0$
$\left(-6\right)^2-4\left(3\right)\left(1\right)$
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