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m in (-oo:+oo)
(1/3)*m+7 = 14/3 // - 14/3
(1/3)*m-(14/3)+7 = 0
(1/3)*m-14/3+7 = 0
1/3*m+7/3 = 0 // - 7/3
1/3*m = -7/3 // : 1/3
m = -7/3/1/3
m = -7
m = -7
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