(a-b)(x-y)+(b-a)(y-x)
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(a-b)(x-y)+(b-a)(y-x)
(a-b)(x-y)+(b-a)(y-x)
(a-b)(x-y)+(b-a)(y-x)
2(a-b)(x-y)
0.00.0~~~~
AX-AY-BX+BY+BY-BX-AY+AX
2AX-2AY+2BY-2BX
2(AX-BX-AY+BY)
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