$9a^4-6a^2\:x+3a^3\:x^2$
$\left(1+x\right)y-xy=x+x^2$
$\frac{3x}{5}=\frac{30}{2x}$
$\left(m-3\right)\left(m-1\right)$
$2x+6y+z=7$
$\left(x+2y-3\right)\left(x+5+2y\right)$
$\frac{3x-2y^2}{27x^3-8y^6}$
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