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= 3p-9=6p-12
=3p-6p=12+9
=-3p=21=
= p=21/-3
=p=-7
⇔3p - 9 = 6p - 12
⇔3p - 6p = -12 + 9
⇔ -3p = -3
⇔ p =
⇔ p = 1