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r in (-oo:+oo)
(r-7.3)/9.2 = -0.739 // + 0.739
(r-7.3)/9.2+0.739 = 0
(r-7.3)/9.2+(0.739*9.2)/9.2 = 0
r+0.739*9.2-7.3 = 0
r-0.5012 = 0
(r-0.5012)/9.2 = 0
(r-0.5012)/9.2 = 0 // * 9.2
r-0.5012 = 0
r-0.5012 = 0 // + 0.5012
r = 0.5012
r = 0.5012
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