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m in (-oo:+oo)
-1/4 = (-1/3)*m+2/3 // - (-1/3)*m+2/3
-((-1/3)*m)-1/4-(2/3) = 0
(1/3)*m-1/4-2/3 = 0
1/3*m-11/12 = 0 // + 11/12
1/3*m = 11/12 // : 1/3
m = 11/12/1/3
m = 11/4
m = 11/4
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