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m in (-oo:+oo)
6*m+2*m-(1/5) = 3 // - 3
6*m+2*m-(1/5)-3 = 0
6*m+2*m-1/5-3 = 0
8*m-16/5 = 0 // + 16/5
8*m = 16/5 // : 8
m = 16/5/8
m = 2/5
m = 2/5
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