factorise (y–x) a+(x–y) b
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=(y-x)a+(x-y) b
=-a(x-y)+(x-y)b
=(x-y) [-a+b]
=(x-y) (b-a)
=-a(x-y)+(x-y)b
=(x-y) [-a+b]
=(x-y) (b-a)
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