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m in (-oo:+oo)
(2/5)*(m+4) = (1/5)*(3*m+9) // - (1/5)*(3*m+9)
(2/5)*(m+4)-((1/5)*(3*m+9)) = 0
(2/5)*(m+4)+(-1/5)*(3*m+9) = 0
2/5*(m+4)-1/5*(3*m+9) = 0
2/5*(m+4)-1/5*(3*m+9) = 0
-1/5*m-1/5 = 0
-1/5*m-1/5 = 0
-1/5*m-1/5 = 0 // + 1/5
-1/5*m = 1/5 // : -1/5
m = 1/5/(-1/5)
m = -1
m = -1
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