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m in (-oo:+oo)
2*m-(m/7) = m+6 // - m+6
2*m-(m/7)-m-6 = 0
6/7*m-6 = 0 // + 6
6/7*m = 6 // : 6/7
m = 6/6/7
m = 7
m = 7
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