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x in (-oo:+oo)
(m^3-p^3)/m-p = 0
(m^3-p^3)/m+(m*(-p))/m = 0
m^3-p^3+m*(-p) = 0
m^3-p^3-(m*p) = 0
(m^3-p^3-(m*p))/m = 0
(m^3-p^3-(m*p))/m = 0 // * m
m^3-p^3-(m*p) = 0
x belongs to the empty set
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