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h in (-oo:+oo)
-((3/4)*h)-7 = 0
(-3/4)*h-7 = 0
-3/4*h-7 = 0 // + 7
-3/4*h = 7 // : -3/4
h = 7/(-3/4)
h = -28/3
h = -28/3
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