ax-bx-ay+by

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ax-bx-ay+byax-bx-ay+byax-bx-ay+byax-bx-ay+by=(ax-ay)-(bx-by)=a(x-y)-b(x-y)=(a-b)(x-y)=(ax-ay)-(bx-by

ax-bx-ay+by
ax-bx-ay+by

ax-bx-ay+by
ax-bx-ay+by
= (ax-ay) -(bx-by)
=a(x-y)-b(x-y)
=(a-b)(x-y)

=(ax-ay)-(bx-by)
=a(x-y)-b(x-y)
=(a-b)(x-y)