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h in (-oo:+oo)
4*5-(5*((3*h)/2))-(2*h) = -18 // + 18
4*5-(5*((3*h)/2))-(2*h)+18 = 0
(-15/2)*h-2*h+4*5+18 = 0
38-19/2*h = 0 // - 38
-19/2*h = -38 // : -19/2
h = -38/(-19/2)
h = 4
h = 4
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