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m in (-oo:+oo)
(-3/7)*(m-9) = 6*m+3 // - 6*m+3
(-3/7)*(m-9)-(6*m)-3 = 0
(-3/7)*(m-9)-6*m-3 = 0
-3/7*(m-9)-6*m-3 = 0
-3/7*(m-9)-6*m-3 = 0
27/7-45/7*m-3 = 0
6/7-45/7*m = 0
6/7-45/7*m = 0
6/7-45/7*m = 0 // - 6/7
-45/7*m = -6/7 // : -45/7
m = -6/7/(-45/7)
m = 2/15
m = 2/15
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