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r in (-oo:+oo)
2.63*r-(3.8*r)-(8.99/1.25)+1.77/2.65 = r // - r
2.63*r-(3.8*r)-r-(8.99/1.25)+1.77/2.65 = 0
2.63*r-3.8*r-r+1.77/2.65-7.192 = 0
-2.17*r-6.52407547 = 0 // + 6.52407547
-2.17*r = 6.52407547 // : -2.17
r = 6.52407547/(-2.17)
r = -3.00648639
r = -3.00648639
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