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h in (-oo:+oo)
(4*h)/7-7 = 3 // - 3
(4*h)/7-7-3 = 0
4/7*h-10 = 0 // + 10
4/7*h = 10 // : 4/7
h = 10/4/7
h = 35/2
h = 35/2
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