Answer
$$\left(y-x\right)\left(y-2x\right)$$
Work Step by Step
Factoring the expression completely, we find:
$$ \left(y^2-yx\right)+\left(-2yx+2x^2\right) \\ y\left(y-x\right)-2x\left(y-x\right) \\ \left(y-x\right)\left(y-2x\right)$$
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