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h in (-oo:+oo)
63 = 7*(1/2)*h // - 7*(1/2)*h
63-(7*(1/2)*h) = 0
(-7/2)*h+63 = 0
63-7/2*h = 0 // - 63
-7/2*h = -63 // : -7/2
h = -63/(-7/2)
h = 18
h = 18
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