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m in (-oo:+oo)
(-2/5)*(m-3) = -8 // + 8
(-2/5)*(m-3)+8 = 0
8-2/5*(m-3) = 0
8-2/5*(m-3) = 0
46/5-2/5*m = 0
46/5-2/5*m = 0
46/5-2/5*m = 0 // - 46/5
-2/5*m = -46/5 // : -2/5
m = -46/5/(-2/5)
m = 23
m = 23
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