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D( R )
R = 0
R = 0
R = 0
R in (-oo:0) U (0:+oo)
2/R = 12 // - 12
2/R-12 = 0
2*R^-1 = 12 // : 2
R^-1 = 6
-1 < 0
1/(R^1) = 6 // * R^1
1 = 6*R^1 // : 6
1/6 = R^1
R = 1/6
R = 1/6
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