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m in (-oo:+oo)
(-4/5)*((5*m-1)/3) = 0
(-4/5*(5*m-1))/3 = 0
( -4/5 )
-4/5 = 0
m belongs to the empty set
( 5*m-1 )
5*m-1 = 0 // + 1
5*m = 1 // : 5
m = 1/5
m = 1/5
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