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h in (-oo:+oo)
27 = (9*h)/3 // - (9*h)/3
27-((9*h)/3) = 0
27-3*h = 0
27-3*h = 0 // - 27
-3*h = -27 // : -3
h = -27/(-3)
h = 9
h = 9
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