x^2-xy-4x+4y=x(x-y)-4(x-y)=(x-y)(x-4)
x(x-y) - 4(x-y)=(x-4)(x-y)
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x^2-xy-4x+4y=x(x-y)-4(x-y)=(x-y)(x-4)
x(x-y) - 4(x-y)=(x-4)(x-y)