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m in (-oo:+oo)
(m-20)/5-((7*m-1)/6) = 1 // - 1
(m-20)/5-((7*m-1)/6)-1 = 0
(m-20)/5+(-1*(7*m-1))/6-1 = 0
(6*(m-20))/(5*6)+(-1*5*(7*m-1))/(5*6)+(-1*5*6)/(5*6) = 0
6*(m-20)-1*5*(7*m-1)-1*5*6 = 0
-29*m-115-30 = 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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