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p in (-oo:+oo)
(1/3)*(6*p+9) = 11 // - 11
(1/3)*(6*p+9)-11 = 0
1/3*(6*p+9)-11 = 0
1/3*(6*p+9)-11 = 0
2*p-8 = 0
2*p-8 = 0
2*p-8 = 0 // + 8
2*p = 8 // : 2
p = 8/2
p = 4
p = 4
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