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m in (-oo:+oo)
(12-(3*m))/9 = (-m-6)/5 // - (-m-6)/5
(12-(3*m))/9-((-m-6)/5) = 0
(12-3*m)/9-((-m-6)/5) = 0
(12-3*m)/9+(-1*(-m-6))/5 = 0
(5*(12-3*m))/(5*9)+(-1*9*(-m-6))/(5*9) = 0
5*(12-3*m)-1*9*(-m-6) = 0
114-6*m = 0
(114-6*m)/(5*9) = 0
(114-6*m)/(5*9) = 0 // * 5*9
114-6*m = 0
114-6*m = 0 // - 114
-6*m = -114 // : -6
m = -114/(-6)
m = 19
m = 19
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