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h in (-oo:+oo)
-h/7.8 = 2 // - 2
-h/7.8-2 = 0
-0.12820513*h-2 = 0 // + 2
-0.12820513*h = 2 // : -0.12820513
h = 2/(-0.12820513)
h = -15.59999978
h = -15.59999978
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