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h in (-oo:+oo)
h/6+0.4+5.7 = 9.2 // - 9.2
h/6-9.2+0.4+5.7 = 0
1/6*h-3.1 = 0 // + 3.1
1/6*h = 3.1 // : 1/6
h = 3.1/1/6
h = 18.59999963
h = 18.59999963
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