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a=1/2(-3+7)=1/2*4=2
b=1/2(2-8)=1/2*(-6)=-3
S=(2,-3)
[ xA+ xB /2, yA+ yB /2] =S
A(-3,2) , B(7,-8)
S=[-3+7 /2 , 2-8 /2]
S=[4/2 , -6/2 ]
S= [2 , -3]