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m in (-oo:+oo)
2*m-((8*m)/5) = (3*m)/45+7/3 // - (3*m)/45+7/3
2*m-((8*m)/5)-((3*m)/45)-(7/3) = 0
2*m+(-8/5)*m+(-1/15)*m-7/3 = 0
1/3*m-7/3 = 0 // + 7/3
1/3*m = 7/3 // : 1/3
m = 7/3/1/3
m = 7
m = 7
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