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D( r )
r^9 = 0
r^9 = 0
r^9 = 0
1*r^9 = 0 // : 1
r^9 = 0
r = 0
r in (-oo:0) U (0:+oo)
160 = (r^10)/(r^9) // - (r^10)/(r^9)
160-((r^10)/(r^9)) = 0
160-r = 0
160-r = 0 // - 160
-r = -160 // * -1
r = 160
r = 160
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