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p in (-oo:+oo)
(3*p)/4+8 = 3*p-55 // - 3*p-55
(3*p)/4-(3*p)+8+55 = 0
(3*p)/4-3*p+8+55 = 0
63-9/4*p = 0 // - 63
-9/4*p = -63 // : -9/4
p = -63/(-9/4)
p = 28
p = 28
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