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h in (-oo:+oo)
216 = 36*(1/3)*h // - 36*(1/3)*h
216-(36*(1/3)*h) = 0
216-12*h = 0
216-12*h = 0 // - 216
-12*h = -216 // : -12
h = -216/(-12)
h = 18
h = 18
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