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m in (-oo:+oo)
m*((5*m^2+m)/7) = 0
(m*(5*m^2+m))/7 = 0
5*m^2+m = 0
m*(5*m+1) = 0
5*m+1 = 0 // - 1
5*m = -1 // : 5
m = -1/5
m*(m+1/5) = 0
(m^2*(m+1/5))/7 = 0
( m+1/5 )
m+1/5 = 0 // - 1/5
m = -1/5
( m )
m = 0
m in { -1/5, 0, 0 }
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