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h in (-oo:+oo)
(4/(-7))*h = -28 // + 28
(4/(-7))*h+28 = 0
28-4/7*h = 0 // - 28
-4/7*h = -28 // : -4/7
h = -28/(-4/7)
h = 49
h = 49
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