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m in (-oo:+oo)
5*(1-(6*m)) = 245 // - 245
5*(1-(6*m))-245 = 0
5*(1-6*m)-245 = 0
5*(1-6*m)-245 = 0
-30*m-240 = 0
-30*m-240 = 0
-30*m-240 = 0 // + 240
-30*m = 240 // : -30
m = 240/(-30)
m = -8
m = -8
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