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AB=(5-(-4),1-0)
AB=(9,1)
BC=(3-5,7-1)
BC=(-2,6)
AC=(3-(-4),7-0)
AC=(7,7)
3(9,1)-(-2,6)+2(7,7)=(27,3)-(-2,6)+(14,14)=(29,-3)+(14,14)=(43,11)