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m in (-oo:+oo)
5/9 = -2.5*m // + -2.5*m
5/9-(-2.5*m) = 0
2.5*m+5/9 = 0
2.5*m+5/9 = 0 // - 5/9
2.5*m = -5/9 // : 2.5
m = -5/9/2.5
m = -0.22222222
m = -0.22222222
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