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m in (-oo:+oo)
(1/3)*m+(1/3)*m-(1/9) = -19/36 // + -19/36
(1/3)*m+(1/3)*m-(1/9)-(-19/36) = 0
(1/3)*m+(1/3)*m-1/9+19/36 = 0
2/3*m+5/12 = 0 // - 5/12
2/3*m = -5/12 // : 2/3
m = -5/12/2/3
m = -5/8
m = -5/8
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