$m^2x+mx^2y+mx$
$\frac{6x^2+42x+38}{x+6}$
$\left(1+z^2\right)^3$
$x^4+8x^3-108x^2-272x+896$
$3x^2=-6x$
$\left(x-9\right)=x^2-81$
$-4\left(3\right)^4+14\left(3\right)^2+9$
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