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h in (-oo:+oo)
5 = 7-((3*h)/(-4)) // - 7-((3*h)/(-4))
(3*h)/(-4)-7+5 = 0
-3/4*h-2 = 0 // + 2
-3/4*h = 2 // : -3/4
h = 2/(-3/4)
h = -8/3
h = -8/3
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