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m in (-oo:+oo)
(6*m)/7-((m-2)/5) = 3 // - 3
(6*m)/7-((m-2)/5)-3 = 0
(-1*(m-2))/5+(6*m)/7-3 = 0
(-1*7*(m-2))/(5*7)+(5*6*m)/(5*7)+(-3*5*7)/(5*7) = 0
5*6*m-1*7*(m-2)-3*5*7 = 0
23*m-105+14 = 0
23*m-91 = 0
(23*m-91)/(5*7) = 0
(23*m-91)/(5*7) = 0 // * 5*7
23*m-91 = 0
23*m-91 = 0 // + 91
23*m = 91 // : 23
m = 91/23
m = 91/23
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