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