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r in (-oo:+oo)
2.61*r-(3.8*r)-(8.99/1.25)-(1.76/2.45) = r // - r
2.61*r-(3.8*r)-r-(8.99/1.25)-(1.76/2.45) = 0
2.61*r-3.8*r-r-7.192-0.71836735 = 0
-2.19*r-7.91036735 = 0 // + 7.91036735
-2.19*r = 7.91036735 // : -2.19
r = 7.91036735/(-2.19)
r = -3.61203989
r = -3.61203989
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