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h in (-oo:+oo)
(1/2)*(h-6) = -7 // + 7
(1/2)*(h-6)+7 = 0
1/2*(h-6)+7 = 0
1/2*(h-6)+7 = 0
1/2*h+4 = 0
1/2*h+4 = 0
1/2*h+4 = 0 // - 4
1/2*h = -4 // : 1/2
h = -4/1/2
h = -8
h = -8
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