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m in (-oo:+oo)
(m-21)/5-((7*m-8)/6) = 0
(m-21)/5+(-1*(7*m-8))/6 = 0
(6*(m-21))/(5*6)+(-1*5*(7*m-8))/(5*6) = 0
6*(m-21)-1*5*(7*m-8) = 0
-29*m-86 = 0
(-29*m-86)/(5*6) = 0
(-29*m-86)/(5*6) = 0 // * 5*6
-29*m-86 = 0
-29*m-86 = 0 // + 86
-29*m = 86 // : -29
m = 86/(-29)
m = -86/29
m = -86/29
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