$9=9b$
$x^2\left(x-xy\right)$
$4x+8x+4$
$\frac{\left(x^2-1x-12\right)}{x^2-4}$
$\left(\sqrt{2xy^3}\right)\left(\sqrt{9y^4}x^7\right)$
$36x^4-60x^2y+25y^2$
$\frac{3x^{2}-5x+4}{x+1}$
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