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h in (-oo:+oo)
0.218 = h/395 // - h/395
0.218-(h/395) = 0
0.218-1/395*h = 0 // - 0.218
-1/395*h = -0.218 // : -1/395
h = -0.218/(-1/395)
h = 86.10984931
h = 86.10984931
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