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m in (-oo:+oo)
(2/3)*m-(1/7) = 4/5 // - 4/5
(2/3)*m-(1/7)-(4/5) = 0
(2/3)*m-1/7-4/5 = 0
2/3*m-33/35 = 0 // + 33/35
2/3*m = 33/35 // : 2/3
m = 33/35/2/3
m = 99/70
m = 99/70
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