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r in (-oo:+oo)
4.66 = r-(1/3) // - r-(1/3)
1/3-r+4.66 = 0
4.99333333-r = 0 // - 4.99333333
-r = -4.99333333 // * -1
r = 4.99333333
r = 4.99333333
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