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r in (-oo:+oo)
-1.11111111111 = r/7.2 // - r/7.2
-(r/7.2)-1.11111111111 = 0
-0.13888889*r-1.11111111111 = 0
-0.13888889*r-1.11111111111 = 0 // + 1.11111111111
-0.13888889*r = 1.11111111111 // : -0.13888889
r = 1.11111111111/(-0.13888889)
r = -7.99999994
r = -7.99999994
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