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h in (-oo:+oo)
h/3 = -6.8 // + 6.8
h/3+6.8 = 0
1/3*h+6.8 = 0 // - 6.8
1/3*h = -6.8 // : 1/3
h = -6.8/1/3
h = -20.4000002
h = -20.4000002
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