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h in (-oo:+oo)
4/2 = (3*h)/12 // - (3*h)/12
4/2-((3*h)/12) = 0
(-1/4)*h+4/2 = 0
2-1/4*h = 0 // - 2
-1/4*h = -2 // : -1/4
h = -2/(-1/4)
h = 8
h = 8
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