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D( R )
R = 0
R = 0
R = 0
R in (-oo:0) U (0:+oo)
1/R-5 = (7/2)*e // - (7/2)*e
1/R-((7/2)*e)-5 = 0
1/R+(-7/2)*e-5 = 0
1*R^-1 = -(-7/2*e-5) // : 1
R^-1 = 5-(-7/2*e)
-1 < 0
1/(R^1) = 5-(-7/2*e) // * R^1
1 = (5-(-7/2*e))*R^1 // : 5-(-7/2*e)
1/(7/2*e+5) = R^1
R = 1/(7/2*e+5)
R = 1/(7/2*e+5)
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