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h in (-oo:+oo)
-1 = (-1/4)*h-7 // - (-1/4)*h-7
7-((-1/4)*h)-1 = 0
(1/4)*h-1+7 = 0
1/4*h+6 = 0 // - 6
1/4*h = -6 // : 1/4
h = -6/1/4
h = -24
h = -24
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