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h in (-oo:+oo)
4.5*h = 3/7 // - 3/7
4.5*h-(3/7) = 0
4.5*h-3/7 = 0
4.5*h-3/7 = 0 // + 3/7
4.5*h = 3/7 // : 4.5
h = 3/7/4.5
h = 0.0952381
h = 0.0952381
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