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r in (-oo:+oo)
-2*r = 16-((2*r)/4) // - 16-((2*r)/4)
(2*r)/4-2*r-16 = 0
-3/2*r-16 = 0 // + 16
-3/2*r = 16 // : -3/2
r = 16/(-3/2)
r = -32/3
r = -32/3
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