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r in (-oo:+oo)
7.6/10 = r/7.5 // - r/7.5
7.6/10-(r/7.5) = 0
7.6/10-0.13333333*r = 0
0.76-0.13333333*r = 0 // - 0.76
-0.13333333*r = -0.76 // : -0.13333333
r = -0.76/(-0.13333333)
r = 5.70000014
r = 5.70000014
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