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h in (-oo:+oo)
2/7-(h/14) = 3/7 // - 3/7
2/7-(h/14)-(3/7) = 0
2/7-(h/14)-3/7 = 0
-1/14*h-1/7 = 0 // + 1/7
-1/14*h = 1/7 // : -1/14
h = 1/7/(-1/14)
h = -2
h = -2
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