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h in (-oo:+oo)
h/3+h/2-(h/4) = 7 // - 7
h/3+h/2-(h/4)-7 = 0
7/12*h-7 = 0 // + 7
7/12*h = 7 // : 7/12
h = 7/7/12
h = 12
h = 12
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