$\frac{6x^2y^{-3}}{2x^{-4}y^{-5}}$
$16b^2+24bc+9c^2$
$9r^2-4r+1$
$\left(x+2y\right)dx-3ydy=0$
$3-8y-16^2$
$-16x+x^2=-15$
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