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m in (-oo:+oo)
(2/3)*m-(4/5) = (1/5)*m-2 // - (1/5)*m-2
(2/3)*m-((1/5)*m)-(4/5)+2 = 0
(2/3)*m+(-1/5)*m-4/5+2 = 0
7/15*m+6/5 = 0 // - 6/5
7/15*m = -6/5 // : 7/15
m = -6/5/7/15
m = -18/7
m = -18/7
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