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