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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
7/r-10.5 = 0
7*r^-1 = 10.5 // : 7
r^-1 = 1.5
-1 < 0
1/(r^1) = 1.5 // * r^1
1 = 1.5*r^1 // : 1.5
0.66666667 = r^1
r = 0.66666667
r = 0.66666667
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