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