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m in (-oo:+oo)
(1/6)*m+(1/6)*m+10 = 12 // - 12
(1/6)*m+(1/6)*m-12+10 = 0
1/3*m-2 = 0 // + 2
1/3*m = 2 // : 1/3
m = 2/1/3
m = 6
m = 6
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