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h in (-oo:+oo)
2.7*h = 3/4 // - 3/4
2.7*h-(3/4) = 0
2.7*h-3/4 = 0
2.7*h-3/4 = 0 // + 3/4
2.7*h = 3/4 // : 2.7
h = 3/4/2.7
h = 0.27777778
h = 0.27777778
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