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m in (-oo:+oo)
(m/(-2))/3 = 3/10 // - 3/10
(m/(-2))/3-(3/10) = 0
(m/(-2))/3-3/10 = 0
-1/6*m-3/10 = 0 // + 3/10
-1/6*m = 3/10 // : -1/6
m = 3/10/(-1/6)
m = -9/5
m = -9/5
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