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r in (-oo:+oo)
4*(r-0.2) = 0.5*r-(0.5/3) // - 0.5*r-(0.5/3)
4*(r-0.2)-(0.5*r)+0.5/3 = 0
4*(r-0.2)-0.5*r+0.5/3 = 0
4*(r-0.2)-0.5*r+0.16666667 = 0
4*(r-0.2)-0.5*r+0.16666667 = 0
3.5*r-0.8+0.16666667 = 0
3.5*r-0.63333333 = 0
3.5*r-0.63333333 = 0
3.5*r-0.63333333 = 0 // + 0.63333333
3.5*r = 0.63333333 // : 3.5
r = 0.63333333/3.5
r = 0.18095238
r = 0.18095238
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