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m in (-oo:+oo)
(3/7)*m+2*m+1/2 = 1/2 // - 1/2
(3/7)*m+2*m+1/2-(1/2) = 0
(3/7)*m+2*m+1/2-1/2 = 0
17/7*m = 0 // : 17/7
m = 0
m = 0
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