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m in (-oo:+oo)
(2/3)*m-(1/5) = 5/7 // - 5/7
(2/3)*m-(1/5)-(5/7) = 0
(2/3)*m-1/5-5/7 = 0
2/3*m-32/35 = 0 // + 32/35
2/3*m = 32/35 // : 2/3
m = 32/35/2/3
m = 48/35
m = 48/35
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