\(=\dfrac{-3x\left(x-y\right)}{6y\left(y-x\right)}=\dfrac{-3x\left(x-y\right)}{-6y\left(x-y\right)}=\dfrac{x}{2y}\)
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\(=\dfrac{-3x\left(x-y\right)}{6y\left(y-x\right)}=\dfrac{-3x\left(x-y\right)}{-6y\left(x-y\right)}=\dfrac{x}{2y}\)