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p in (-oo:+oo)
123/8 = -5*p // + -5*p
123/8-(-5*p) = 0
5*p+123/8 = 0
5*p+123/8 = 0 // - 123/8
5*p = -123/8 // : 5
p = -123/8/5
p = -123/40
p = -123/40
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