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