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r in (-oo:+oo)
8 = r/1.9 // - r/1.9
8-(r/1.9) = 0
8-0.52631579*r = 0
8-0.52631579*r = 0 // - 8
-0.52631579*r = -8 // : -0.52631579
r = -8/(-0.52631579)
r = 15.19999998
r = 15.19999998
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