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D( R )
R = 0
R = 0
R = 0
R in (-oo:0) U (0:+oo)
1140/R = 1000 // - 1000
1140/R-1000 = 0
1140*R^-1 = 1000 // : 1140
R^-1 = 50/57
-1 < 0
1/(R^1) = 50/57 // * R^1
1 = 50/57*R^1 // : 50/57
57/50 = R^1
R = 57/50
R = 57/50
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