A (3,4,3) B(-3,2,2) C(5,0,4) D(7,-3,4) E(-5,4,-4) F(0,-4,-4) (a y b forman la recta r)
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2
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5
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7
-1
-2
-3
-4
-5
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-7
x
y
a'
a
b'
b
c'
c
d
d'
e=e'
f'
f
z