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m in (-oo:+oo)
(1/3)*m+(1/2)*m+7 = -1/2 // + -1/2
(1/3)*m+(1/2)*m-(-1/2)+7 = 0
(1/3)*m+(1/2)*m+1/2+7 = 0
5/6*m+15/2 = 0 // - 15/2
5/6*m = -15/2 // : 5/6
m = -15/2/5/6
m = -9
m = -9
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