a: =x(x-y)-(x-y)=(x-y)(x-1)
b: \(=\left(x-5\right)^2-y^2=\left(x-5-y\right)\left(x-5+y\right)\)
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a: =x(x-y)-(x-y)=(x-y)(x-1)
b: \(=\left(x-5\right)^2-y^2=\left(x-5-y\right)\left(x-5+y\right)\)