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m in (-oo:+oo)
(3*m)/5-(2/5) = 7/10 // - 7/10
(3*m)/5-(2/5)-(7/10) = 0
(3*m)/5-2/5-7/10 = 0
3/5*m-11/10 = 0 // + 11/10
3/5*m = 11/10 // : 3/5
m = 11/10/3/5
m = 11/6
m = 11/6
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