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m in (-oo:+oo)
(2/5)*m = -8/9 // + -8/9
(2/5)*m-(-8/9) = 0
(2/5)*m+8/9 = 0
2/5*m+8/9 = 0 // - 8/9
2/5*m = -8/9 // : 2/5
m = -8/9/2/5
m = -20/9
m = -20/9
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