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h in (-oo:+oo)
4/30 = h/90 // - h/90
4/30-(h/90) = 0
2/15-1/90*h = 0 // - 2/15
-1/90*h = -2/15 // : -1/90
h = -2/15/(-1/90)
h = 12
h = 12
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