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h in (-oo:+oo)
7*h+7*h-(8*h)+5/7 = 0
7*h+7*h-8*h+5/7 = 0
6*h+5/7 = 0 // - 5/7
6*h = -5/7 // : 6
h = -5/7/6
h = -5/42
h = -5/42
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