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m in (-oo:+oo)
m-(6*m)-(13/3)-(26/7) = 2 // - 2
m-(6*m)-(13/3)-(26/7)-2 = 0
m-6*m-13/3-26/7-2 = 0
-5*m-211/21 = 0 // + 211/21
-5*m = 211/21 // : -5
m = 211/21/(-5)
m = -211/105
m = -211/105
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