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r in (-oo:+oo)
r/6 = 3.5 // - 3.5
r/6-3.5 = 0
1/6*r-3.5 = 0 // + 3.5
1/6*r = 3.5 // : 1/6
r = 3.5/1/6
r = 20.99999958
r = 20.99999958
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