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m in (-oo:+oo)
(m-15)/5-((7*m-7)/6) = 3 // - 3
(m-15)/5-((7*m-7)/6)-3 = 0
(m-15)/5+(-1*(7*m-7))/6-3 = 0
(6*(m-15))/(5*6)+(-1*5*(7*m-7))/(5*6)+(-3*5*6)/(5*6) = 0
6*(m-15)-1*5*(7*m-7)-3*5*6 = 0
-29*m-90-55 = 0
-29*m-145 = 0
(-29*m-145)/(5*6) = 0
(-29*m-145)/(5*6) = 0 // * 5*6
-29*m-145 = 0
-29*m-145 = 0 // + 145
-29*m = 145 // : -29
m = 145/(-29)
m = -5
m = -5
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