2
ρ
v
p
=
p
m
(
3
ρ
v
−
2
ρ
)
=
3
ρ
v
p
m
−
2
ρ
p
m
2
ρ
v
p
=
p
m
(
3
ρ
v
−
2
ρ
)
=
3
ρ
v
p
m
−
2
ρ
p
m
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