$-4w-2\left(-5z+w\right)-5z$
$x^4y+y^4x$
$x^2+10x-1$
$y^2-6y+9=0$
$\frac{x^2-13x+39}{x-6}$
$-9x=-9x+3$
$\frac{9m^2n}{-4mn^2}$
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