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r in (-oo:+oo)
(2/3)*r = 1.6 // - 1.6
(2/3)*r-1.6 = 0
2/3*r-1.6 = 0 // + 1.6
2/3*r = 1.6 // : 2/3
r = 1.6/2/3
r = 2.39999999
r = 2.39999999
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