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m in (-oo:+oo)
(3/5)*m+6 = 3*m-54/5 // - 3*m-54/5
(3/5)*m-(3*m)-(-54/5)+6 = 0
(3/5)*m-3*m+54/5+6 = 0
84/5-12/5*m = 0 // - 84/5
-12/5*m = -84/5 // : -12/5
m = -84/5/(-12/5)
m = 7
m = 7
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