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h in (-oo:+oo)
2/7-(h/4) = 3/7 // - 3/7
2/7-(h/4)-(3/7) = 0
2/7-(h/4)-3/7 = 0
-1/4*h-1/7 = 0 // + 1/7
-1/4*h = 1/7 // : -1/4
h = 1/7/(-1/4)
h = -4/7
h = -4/7
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