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h in (-oo:+oo)
h/8 = 8/18 // - 8/18
h/8-(8/18) = 0
h/8-4/9 = 0
1/8*h-4/9 = 0 // + 4/9
1/8*h = 4/9 // : 1/8
h = 4/9/1/8
h = 32/9
h = 32/9
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