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m in (-oo:+oo)
(3*m)/10-6 = 4-((5*m)/2) // - 4-((5*m)/2)
(3*m)/10+(5*m)/2-6-4 = 0
14/5*m-10 = 0 // + 10
14/5*m = 10 // : 14/5
m = 10/14/5
m = 25/7
m = 25/7
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