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r in (-oo:+oo)
2*r-(3/3) = 0.6 // - 0.6
2*r-(3/3)-0.6 = 0
2*r-1-0.6 = 0
2*r-1.6 = 0 // + 1.6
2*r = 1.6 // : 2
r = 1.6/2
r = 0.8
r = 0.8
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