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m in (-oo:+oo)
(2/3)*m-((3/5)*m) = 4 // - 4
(2/3)*m-((3/5)*m)-4 = 0
(2/3)*m+(-3/5)*m-4 = 0
1/15*m-4 = 0 // + 4
1/15*m = 4 // : 1/15
m = 4/1/15
m = 60
m = 60
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