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h in (-oo:+oo)
(1/4)*(h+12) = 7 // - 7
(1/4)*(h+12)-7 = 0
1/4*(h+12)-7 = 0
1/4*(h+12)-7 = 0
1/4*h-4 = 0
1/4*h-4 = 0
1/4*h-4 = 0 // + 4
1/4*h = 4 // : 1/4
h = 4/1/4
h = 16
h = 16
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