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m in (-oo:+oo)
(1/2)*(-12*m-6) = 39 // - 39
(1/2)*(-12*m-6)-39 = 0
1/2*(-12*m-6)-39 = 0
1/2*(-12*m-6)-39 = 0
-6*m-42 = 0
-6*m-42 = 0
-6*m-42 = 0 // + 42
-6*m = 42 // : -6
m = 42/(-6)
m = -7
m = -7
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