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B=(x,y)
1/2(x-3)=-2
x-3=-4
x=-1
1/2(y-1)=-3
y-1=-6
y=-5
B=(-1,-5)
2.
A=(x,y)
1/2(x+3)=2
x+3=4
x=1
1/2(y+2)=-1
y+2=-2
y=-4
A=(1,-4)
3.
a)
A'=(-2,2), B'=(3,-1), C'=(-4,-7)
b)
A'=(2,-2), B'=(-3,1), C'=(4,7)
c)
A'=(2,2), B'=(-3,-1), C'=(4,-7)