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6p + 15 = 3p + 9
15 - 9 = 3p- 6p
4 = -3p
-4/3 = p
p = -4/3
6p + 15 = 3p + 9
6p - 3p = 9 - 15
3p = -6
p = -2
(2x+3) (3x-5) = 6x² - 10x + 9x - 15
= 6x² - x - 15