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p in (-oo:+oo)
3*p-20 = 1/2 // - 1/2
3*p-(1/2)-20 = 0
3*p-1/2-20 = 0
3*p-41/2 = 0 // + 41/2
3*p = 41/2 // : 3
p = 41/2/3
p = 41/6
p = 41/6
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