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h in (-oo:+oo)
h/12 = 5/4 // - 5/4
h/12-(5/4) = 0
h/12-5/4 = 0
1/12*h-5/4 = 0 // + 5/4
1/12*h = 5/4 // : 1/12
h = 5/4/1/12
h = 15
h = 15
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