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m in (-oo:+oo)
(2/5)*m+3*m+10 = 67/5 // - 67/5
(2/5)*m+3*m-(67/5)+10 = 0
(2/5)*m+3*m-67/5+10 = 0
17/5*m-17/5 = 0 // + 17/5
17/5*m = 17/5 // : 17/5
m = 17/5/17/5
m = 1
m = 1
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