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h in (-oo:+oo)
10.2/4 = h/12 // - h/12
10.2/4-(h/12) = 0
2.55-1/12*h = 0 // - 2.55
-1/12*h = -2.55 // : -1/12
h = -2.55/(-1/12)
h = 30.60000122
h = 30.60000122
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