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m in (-oo:+oo)
(3*(2*m-4))/(-5)-(10/(-5)) = -4 // + 4
(3*(2*m-4))/(-5)-(10/(-5))+4 = 0
(3*(2*m-4))/(-5)+2+4 = 0
(3*(2*m-4))/(-5)+(-5*2)/(-5)+(-5*4)/(-5) = 0
3*(2*m-4)-5*2-5*4 = 0
6*m-22-20 = 0
6*m-42 = 0
(6*m-42)/(-5) = 0
(6*m-42)/(-5) = 0 // * -5
6*m-42 = 0
6*m-42 = 0 // + 42
6*m = 42 // : 6
m = 42/6
m = 7
m = 7
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