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m in (-oo:+oo)
m*((2*m+2)/48) = 0
(m*(2*m+2))/48 = 0
( 2*m+2 )
2*m+2 = 0 // - 2
2*m = -2 // : 2
m = -2/2
m = -1
( m )
m = 0
m in { -1, 0 }
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