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m in (-oo:+oo)
(1/3)*(m+6)+(1/2)*m = 7 // - 7
(1/3)*(m+6)+(1/2)*m-7 = 0
1/3*(m+6)+m/2-7 = 0
(1/3*2*(m+6))/2+m/2+(-7*2)/2 = 0
1/3*2*(m+6)+m-7*2 = 0
5/3*m-14+4 = 0
5/3*m-10 = 0
(5/3*m-10)/2 = 0
(5/3*m-10)/2 = 0 // * 2
5/3*m-10 = 0
5/3*m-10 = 0 // + 10
5/3*m = 10 // : 5/3
m = 10/5/3
m = 6
m = 6
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