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r in (-oo:+oo)
r/(-6.7) = 7.9 // - 7.9
r/(-6.7)-7.9 = 0
-0.14925373*r-7.9 = 0 // + 7.9
-0.14925373*r = 7.9 // : -0.14925373
r = 7.9/(-0.14925373)
r = -52.93000048
r = -52.93000048
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