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m in (-oo:+oo)
-0.4 = m/0.3 // - m/0.3
-(m/0.3)-0.4 = 0
-3.33333333*m-0.4 = 0
-3.33333333*m-0.4 = 0 // + 0.4
-3.33333333*m = 0.4 // : -3.33333333
m = 0.4/(-3.33333333)
m = -0.12
m = -0.12
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