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