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p in (-oo:+oo)
(2/3)*p-(1/2) = 15 // - 15
(2/3)*p-(1/2)-15 = 0
(2/3)*p-1/2-15 = 0
2/3*p-31/2 = 0 // + 31/2
2/3*p = 31/2 // : 2/3
p = 31/2/2/3
p = 93/4
p = 93/4
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