allow me to answer your question with another question:
why is this in the calculus section?
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4p - 12 = 3p - 8 - 9p 4p - 3p + 9p = -8 + 12 10p = 4 p = 0.4 (or 2/5)
9p + 12
-9p + 6p = -3p
-14 + 3p = -9p - 21 add 14 and 9p to both sides, then 12p = -7 p = -7/12
9p + 27 = 9(p + 3)