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h in (-oo:+oo)
h/7 = h-(19/8) // - h-(19/8)
h/7-h+19/8 = 0
19/8-6/7*h = 0 // - 19/8
-6/7*h = -19/8 // : -6/7
h = -19/8/(-6/7)
h = 133/48
h = 133/48
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