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m in (-oo:+oo)
(12*m)/(-5) = 3 // - 3
(12*m)/(-5)-3 = 0
-12/5*m-3 = 0 // + 3
-12/5*m = 3 // : -12/5
m = 3/(-12/5)
m = -5/4
m = -5/4
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