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r in (-oo:+oo)
3 = r/3.3 // - r/3.3
3-(r/3.3) = 0
3-0.3030303*r = 0
3-0.3030303*r = 0 // - 3
-0.3030303*r = -3 // : -0.3030303
r = -3/(-0.3030303)
r = 9.9000001
r = 9.9000001
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