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r in (-oo:+oo)
2.62*r-(3.8*r)-(8.97/1.25)-(1.78/2.45) = 0
2.62*r-3.8*r-7.176-0.72653061 = 0
-1.18*r-7.90253061 = 0 // + 7.90253061
-1.18*r = 7.90253061 // : -1.18
r = 7.90253061/(-1.18)
r = -6.69705984
r = -6.69705984
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