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m in (-oo:+oo)
(2/3)*m-(1/5) = 6/7 // - 6/7
(2/3)*m-(1/5)-(6/7) = 0
(2/3)*m-1/5-6/7 = 0
2/3*m-37/35 = 0 // + 37/35
2/3*m = 37/35 // : 2/3
m = 37/35/2/3
m = 111/70
m = 111/70
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