$y^2-6y+9=0$
$\frac{2a+3b}{3a-2b}-\frac{3a+2b}{3a-2b}$
$\left(4c-9\right)\left(4c-1\right)$
$-9x-9x-9$
$\:\sqrt{\left(a+b\right)^2+\left(a+2b\right)^2-2a^2-6ab-5b^2}$
$250\sqrt{100}$
$\frac{12^{-2}}{2^{-2}}$
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