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r in (-oo:+oo)
1/9 = r/0.3 // - r/0.3
1/9-(r/0.3) = 0
1/9-3.33333333*r = 0
1/9-3.33333333*r = 0 // - 1/9
-3.33333333*r = -1/9 // : -3.33333333
r = -1/9/(-3.33333333)
r = 0.03333333
r = 0.03333333
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