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r in (-oo:+oo)
2.61*r-(3.8*r)-(8.98/1.25)-(1.76/2.35) = r // - r
2.61*r-(3.8*r)-r-(8.98/1.25)-(1.76/2.35) = 0
2.61*r-3.8*r-r-7.184-0.74893617 = 0
-2.19*r-7.93293617 = 0 // + 7.93293617
-2.19*r = 7.93293617 // : -2.19
r = 7.93293617/(-2.19)
r = -3.62234528
r = -3.62234528
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