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h in (-oo:+oo)
(1/8)*(h+18) = 7 // - 7
(1/8)*(h+18)-7 = 0
1/8*(h+18)-7 = 0
1/8*(h+18)-7 = 0
1/8*h-19/4 = 0
1/8*h-19/4 = 0
1/8*h-19/4 = 0 // + 19/4
1/8*h = 19/4 // : 1/8
h = 19/4/1/8
h = 38
h = 38
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