x(a-b)+y(b-a)= - x(b - a) + y(b - a) = (b - a)(y - x)
x(a-b)+y(b-a)=x(-b+a)+y(b-a) = x*(-1)(b-a)+y(b-a)=
=-x(b-a)+y(b-a) = (b-a)(y-x)
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x(a-b)+y(b-a)= - x(b - a) + y(b - a) = (b - a)(y - x)
x(a-b)+y(b-a)=x(-b+a)+y(b-a) = x*(-1)(b-a)+y(b-a)=
=-x(b-a)+y(b-a) = (b-a)(y-x)