$6x+3=9$
$-9.\:-9\:.-9$
$\left(11-ab^3\right)^2$
$-100-773$
$x-y+4x+5y+7+2x+3y-z$
$x^2+8x=3$
$\frac{x^3+x^2+x-1}{x+1}$
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