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h in (-oo:+oo)
h/3 = 30/18 // - 30/18
h/3-(30/18) = 0
h/3-5/3 = 0
1/3*h-5/3 = 0 // + 5/3
1/3*h = 5/3 // : 1/3
h = 5/3/1/3
h = 5
h = 5
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