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r in (-oo:+oo)
2.9*r+5.6*r-9.7 = (17.6/4.6)*r // - (17.6/4.6)*r
2.9*r+5.6*r-((17.6/4.6)*r)-9.7 = 0
2.9*r+5.6*r-3.82608696*r-9.7 = 0
4.67391304*r-9.7 = 0 // + 9.7
4.67391304*r = 9.7 // : 4.67391304
r = 9.7/4.67391304
r = 2.07534884
r = 2.07534884
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