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r in (-oo:+oo)
(-7.3*r)/9.2 = -0.739 // + 0.739
(-7.3*r)/9.2+0.739 = 0
0.739-0.79347826*r = 0 // - 0.739
-0.79347826*r = -0.739 // : -0.79347826
r = -0.739/(-0.79347826)
r = 0.93134247
r = 0.93134247
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