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h in (-oo:+oo)
35 = 7*(1/2)*h // - 7*(1/2)*h
35-(7*(1/2)*h) = 0
(-7/2)*h+35 = 0
35-7/2*h = 0 // - 35
-7/2*h = -35 // : -7/2
h = -35/(-7/2)
h = 10
h = 10
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