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M in (-oo:+oo)
(M-2)/5 = (M-4)/3 // - (M-4)/3
(M-2)/5-((M-4)/3) = 0
(M-2)/5+(-1*(M-4))/3 = 0
(3*(M-2))/(3*5)+(-1*5*(M-4))/(3*5) = 0
3*(M-2)-1*5*(M-4) = 0
14-2*M = 0
(14-2*M)/(3*5) = 0
(14-2*M)/(3*5) = 0 // * 3*5
14-2*M = 0
14-2*M = 0 // - 14
-2*M = -14 // : -2
M = -14/(-2)
M = 7
M = 7
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