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y in (-oo:+oo)
-0.9999 = y/(-681.81) // - y/(-681.81)
-(y/(-681.81))-0.9999 = 0
0.00146668*y-0.9999 = 0
0.00146668*y-0.9999 = 0 // + 0.9999
0.00146668*y = 0.9999 // : 0.00146668
y = 0.9999/0.00146668
y = 681.74380233
y = 681.74380233
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