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r in (-oo:+oo)
(6*r+2.04)/4 = 7 // - 7
(6*r+2.04)/4-7 = 0
(6*r+2.04)/4+(-7*4)/4 = 0
6*r-7*4+2.04 = 0
6*r-25.96 = 0
(6*r-25.96)/4 = 0
(6*r-25.96)/4 = 0 // * 4
6*r-25.96 = 0
6*r-25.96 = 0 // + 25.96
6*r = 25.96 // : 6
r = 25.96/6
r = 4.32666667
r = 4.32666667
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