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r in (-oo:+oo)
r/3 = 8.9 // - 8.9
r/3-8.9 = 0
1/3*r-8.9 = 0 // + 8.9
1/3*r = 8.9 // : 1/3
r = 8.9/1/3
r = 26.70000027
r = 26.70000027
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