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p in (-oo:+oo)
(1/3)*(4*p-9) = 8*p+12 // - 8*p+12
(1/3)*(4*p-9)-(8*p)-12 = 0
(1/3)*(4*p-9)-8*p-12 = 0
1/3*(4*p-9)-8*p-12 = 0
1/3*(4*p-9)-8*p-12 = 0
-20/3*p-12-3 = 0
-20/3*p-15 = 0
-20/3*p-15 = 0
-20/3*p-15 = 0 // + 15
-20/3*p = 15 // : -20/3
p = 15/(-20/3)
p = -9/4
p = -9/4
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