$2m^2-14m+20$
$1+20x^4-4x^3-5x$
$f\left(x\right)=\left(3-x\right)\sqrt{x-12}$
$14z+z$
$6x+1=x+6$
$\left(1+x-5x^2\right)\cdot\left(1-x\right)$
$3x+\frac{x}{2}$
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